Light fixtures all have a MAXimum wattage rating for bulb size. Most
standard indoor home fixtures are rated at 100W or less. (60W is
common). But this rating is for incandescent bulbs, and based on how
much heat the fixture can handle. Yet, these days incandescent bulbs
are becoming rare in homes. But lets say a fixture is rated at 60W MAX.
A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that
the fixture could actually handle FOUR of these bulbs (if they would
fit)? Or is the limit still based on the *Equivalant* rating?

I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,
but what if I install a 150W *Equivalant* bulb, which only uses around
30W? I know it's all abotu heat, and a CFL dont get as hot as a
incandescent bulb, but they still do put out some heat.

I guess the ratings on fixtures are sort of obsolete, and I have not yet
seen a CFL or LED rating on even the newest fixtures. I can only assume
they are speaking about ACTUAL wattage consumption, regardless of bulb
type. Is this correct?

On 01/15/2014 10:08 AM, wrote:
Light fixtures all have a MAXimum wattage rating for bulb size. Most
standard indoor home fixtures are rated at 100W or less. (60W is
common). But this rating is for incandescent bulbs, and based on how
much heat the fixture can handle. Yet, these days incandescent bulbs
are becoming rare in homes. But lets say a fixture is rated at 60W MAX.
A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that
the fixture could actually handle FOUR of these bulbs (if they would
fit)? Or is the limit still based on the *Equivalant* rating?

I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,
but what if I install a 150W *Equivalant* bulb, which only uses around
30W? I know it's all abotu heat, and a CFL dont get as hot as a
incandescent bulb, but they still do put out some heat.

I guess the ratings on fixtures are sort of obsolete, and I have not yet
seen a CFL or LED rating on even the newest fixtures. I can only assume
they are speaking about ACTUAL wattage consumption, regardless of bulb
type. Is this correct?




I'd assume that to be correct.

Also, though the CFL's run fairly cool


I've heard that the base of the LED style runs very hot

On Wednesday, January 15, 2014 11:08:34 AM UTC-5, wrote:
Light fixtures all have a MAXimum wattage rating for bulb size. Most

standard indoor home fixtures are rated at 100W or less. (60W is

common). But this rating is for incandescent bulbs, and based on how

much heat the fixture can handle. Yet, these days incandescent bulbs

are becoming rare in homes. But lets say a fixture is rated at 60W MAX.

A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that

the fixture could actually handle FOUR of these bulbs (if they would

fit)? Or is the limit still based on the *Equivalant* rating?



I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,

but what if I install a 150W *Equivalant* bulb, which only uses around

30W? I know it's all abotu heat, and a CFL dont get as hot as a

incandescent bulb, but they still do put out some heat.



I guess the ratings on fixtures are sort of obsolete, and I have not yet

seen a CFL or LED rating on even the newest fixtures. I can only assume

they are speaking about ACTUAL wattage consumption, regardless of bulb

type. Is this correct?

Basically, it's the actual wattage that's of most interest
because it reflects the heat generated, the current through
the wires, etc. If you had a fixture that's rated for 60W
incandescent, I don't see any problem putting a 100W CFL in
it, as that's only about 23W. And from a practical standpoint
I don;t think you'd want a CFL, LED, etc that was anywhere
close to the old incandescent max rating. For a 60W, it
would take what, 260W to get close to that 60W in actual
power? So, if you put a 100W, 150W in it, ?I don't see
a problem.

On Wednesday, January 15, 2014 12:07:18 PM UTC-5, wrote:
On Wednesday, January 15, 2014 11:08:34 AM UTC-5, wrote:

Light fixtures all have a MAXimum wattage rating for bulb size. Most



standard indoor home fixtures are rated at 100W or less. (60W is



common). But this rating is for incandescent bulbs, and based on how



much heat the fixture can handle. Yet, these days incandescent bulbs



are becoming rare in homes. But lets say a fixture is rated at 60W MAX.



A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that



the fixture could actually handle FOUR of these bulbs (if they would



fit)? Or is the limit still based on the *Equivalant* rating?







I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,



but what if I install a 150W *Equivalant* bulb, which only uses around



30W? I know it's all abotu heat, and a CFL dont get as hot as a



incandescent bulb, but they still do put out some heat.







I guess the ratings on fixtures are sort of obsolete, and I have not yet



seen a CFL or LED rating on even the newest fixtures. I can only assume



they are speaking about ACTUAL wattage consumption, regardless of bulb



type. Is this correct?



Basically, it's the actual wattage that's of most interest

because it reflects the heat generated, the current through

the wires, etc. If you had a fixture that's rated for 60W

incandescent, I don't see any problem putting a 100W CFL in

it, as that's only about 23W. And from a practical standpoint

I don;t think you'd want a CFL, LED, etc that was anywhere

close to the old incandescent max rating. For a 60W, it

would take what, 260W to get close to that 60W in actual

power? So, if you put a 100W, 150W in it, ?I don't see

a problem.

I should have pointed out that it can also depend on the
type of fixture. Even CFL can get hot, shorten the life
if they are installed in a small, enclosed type fixture
with limited airflow. Unlike incandescent, CFL, LED
have electronics that are sensitive to heat. If it's
a wide open fixture with good air flow, you could push
it further in size than if it's a smaller, totally enclosed
fixture. Still, even in an enclosed fixture, I'd have
no problem in going from 60W to 100W, ie the typical
type of increase you might want.

On 1/15/2014 11:09 AM, wrote:
On Wed, 15 Jan 2014 10:08:34 -0600, wrote:

Light fixtures all have a MAXimum wattage rating for bulb size. Most
standard indoor home fixtures are rated at 100W or less. (60W is
common). But this rating is for incandescent bulbs, and based on how
much heat the fixture can handle. Yet, these days incandescent bulbs
are becoming rare in homes. But lets say a fixture is rated at 60W MAX.
A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that
the fixture could actually handle FOUR of these bulbs (if they would
fit)? Or is the limit still based on the *Equivalant* rating?

I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,
but what if I install a 150W *Equivalant* bulb, which only uses around
30W? I know it's all abotu heat, and a CFL dont get as hot as a
incandescent bulb, but they still do put out some heat.

I guess the ratings on fixtures are sort of obsolete, and I have not yet
seen a CFL or LED rating on even the newest fixtures. I can only assume
they are speaking about ACTUAL wattage consumption, regardless of bulb
type. Is this correct?

The only issue I see with this idea is that CFLs fail from heat a lot
quicker.
I doubt you are going to cause a problem with the surrounding wires or
building finish but you may shorten the life of the CFL.
You have that problem with CFLs mounted base up too.

In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

On 1/15/2014 11:08 AM, wrote:
Light fixtures all have a MAXimum wattage rating for bulb size. Most
standard indoor home fixtures are rated at 100W or less. (60W is
common). But this rating is for incandescent bulbs, and based on how
much heat the fixture can handle. Yet, these days incandescent bulbs
are becoming rare in homes. But lets say a fixture is rated at 60W MAX.
A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that
the fixture could actually handle FOUR of these bulbs (if they would
fit)? Or is the limit still based on the *Equivalant* rating?

I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,
but what if I install a 150W *Equivalant* bulb, which only uses around
30W? I know it's all abotu heat, and a CFL dont get as hot as a
incandescent bulb, but they still do put out some heat.

I guess the ratings on fixtures are sort of obsolete, and I have not yet
seen a CFL or LED rating on even the newest fixtures. I can only assume
they are speaking about ACTUAL wattage consumption, regardless of bulb
type. Is this correct?

I think you're correct. It has to do with
ventilation,and how much heat can be dissipated.

--
..
Christopher A. Young
Learn about Jesus
www.lds.org
..

On Wed, 15 Jan 2014 11:13:35 -0600, bud-- wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

I have a lot of those "boob lights" in my house. They are sealed. So,
for incandescent bulbs, the heat would be somewhat trapped, and could be
hard on the wires and surroundings. Yet, that is the type of bulb that
was originally used. So I feel there is much less of a problem with CFL
bulbs. I am not familiar enough with LED bulbs, but I'd guess that the
heat would be about the same as a CFL.

wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, bud-- wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

I have a lot of those "boob lights" in my house. They are sealed. So,
for incandescent bulbs, the heat would be somewhat trapped, and could be
hard on the wires and surroundings. Yet, that is the type of bulb that
was originally used. So I feel there is much less of a problem with CFL
bulbs. I am not familiar enough with LED bulbs, but I'd guess that the
heat would be about the same as a CFL.

Hi,
Not really. Light waves are not all equal. There wave length is at near
the opposite end. (Infra red ------- Ultra violet) CFL bulb itself does
not get as hot but the base which contains electronic CFL driver gets
pretty hot. If this heat is not allowed to dissipate well, that is not
good. One reason CFLs' early failure.

posted for all of us...

And I know how to SNIP


Light fixtures all have a MAXimum wattage rating for bulb size. Most
standard indoor home fixtures are rated at 100W or less. (60W is
common). But this rating is for incandescent bulbs, and based on how
much heat the fixture can handle. Yet, these days incandescent bulbs
are becoming rare in homes. But lets say a fixture is rated at 60W MAX.
A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that
the fixture could actually handle FOUR of these bulbs (if they would
fit)? Or is the limit still based on the *Equivalant* rating?

I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,
but what if I install a 150W *Equivalant* bulb, which only uses around
30W? I know it's all abotu heat, and a CFL dont get as hot as a
incandescent bulb, but they still do put out some heat.

I guess the ratings on fixtures are sort of obsolete, and I have not yet
seen a CFL or LED rating on even the newest fixtures. I can only assume
they are speaking about ACTUAL wattage consumption, regardless of bulb
type. Is this correct?

Hmm, what about halogens?

--
Tekkie

wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, bud-- wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

I have a lot of those "boob lights" in my house. They are sealed. So,
for incandescent bulbs, the heat would be somewhat trapped, and could be
hard on the wires and surroundings. Yet, that is the type of bulb that
was originally used. So I feel there is much less of a problem with CFL
bulbs. I am not familiar enough with LED bulbs, but I'd guess that the
heat would be about the same as a CFL.

I've had cfl last full lifetime outdoors, in a confined jar type housing.
24/7 in the hot summer sun, through winter. I imagine the max temp was
pretty hot at times.

Figure led heat sinks should be near Room temp if maximum life is to be
expected. Most are much hotter. I don't have experience running them 24/7.

Greg

On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
shorter wavelengths radiate better.


I have a lot of those "boob lights" in my house. They are sealed. So,
for incandescent bulbs, the heat would be somewhat trapped, and could be
hard on the wires and surroundings. Yet, that is the type of bulb that
was originally used. So I feel there is much less of a problem with CFL
bulbs. I am not familiar enough with LED bulbs, but I'd guess that the
heat would be about the same as a CFL.


For a CFL with equal light output, the CFL has about 1/4 the wattage,
and a smaller percentage of those watts become heat at the bulb. So it
produces a lot less heat than an incandescent. But as g wrote a couple
posts ago, the electronics in CFLs are far more sensitive to heat.

On Thursday, January 16, 2014 11:07:06 AM UTC-5, bud-- wrote:
On 1/15/2014 1:37 PM, wrote:

On Wed, 15 Jan 2014 11:13:35 -0600, wrote:





In addition to that, I think Don Klipstein said the heat produced by

CFLs does not radiate out of the fixture as well as the heat from

incandescents.



Why would that be? Heat is heat!



Incandescents get a lot hotter than CFLs. A higher percentage of the IR

would be shorter wavelengths, closer to red. My guess is that the

shorter wavelengths radiate better.



I would think a bigger factor would be that CFL's have some
kind of switching power supply in the base of the bulb and
that probably is where most of the heat is being generated,
so it's concentrated in the base. With an incandescent the
heat is spread out over the whole bulb.

bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.

On Wednesday, January 15, 2014 11:02:11 AM UTC-6, philo* wrote:
On 01/15/2014 10:08 AM, wrote:

I've heard that the base of the LED style runs very hot

It must depend how they are made...I have a 40W eq. LED that is always on. It's barely warm. On the other hand, many CFL bases can be very hot!

On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


Correct.

But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.

On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi.
You know that CFL light temp. is higher than incandescent ones.

On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?

On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

It is totally irrelevant to the heat that is dissipated from the lamp
(which is IR).

bud-- wrote:
On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat
produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of
the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

It is totally irrelevant to the heat that is dissipated from the lamp
(which is IR).

Hi,
How come? Higher temp. is further away from red, lower temp. is closer
to red. And you say irrellevant? You mean CFL heats as well as
incandescent lamp?

In article ,
Tony Hwang wrote:
bud-- wrote:
On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat
produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of
the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

It is totally irrelevant to the heat that is dissipated from the lamp
(which is IR).

Hi,
How come? Higher temp. is further away from red, lower temp. is closer
to red. And you say irrellevant? You mean CFL heats as well as
incandescent lamp?

We're talking about two different things here.

1. The amount of heat radiated by a light bulb. Incandescent bulbs
radiate a lot of heat (mostly from the glass bulb).
CFLs radiate much less (mostly from the electronics in the base).

2. The color temperature of the light emitted by the bulb. Color
temperature http://en.wikipedia.org/wiki/Color_temperature
is a way of talking about the wavelength of light. It's about
how the light looks.

I'm not going to pretend I know much about it, and I'm not going to
regurgitate what Wikipedia has to say. My husband has a degree in
electro-optics, so I've absorbed (heh) some information haphazardly
over the last quarter-century.

Cindy Hamilton
--

On 1/20/2014 3:05 PM, Tony Hwang wrote:
bud-- wrote:
On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat
produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of
the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

It is totally irrelevant to the heat that is dissipated from the lamp
(which is IR).

Hi,
How come? Higher temp. is further away from red, lower temp. is closer
to red. And you say irrellevant? You mean CFL heats as well as
incandescent lamp?


If you heat a piece of metal up it gets hot, eventually glows red,
orange, ...white, blueish-white. When it is about 2700 degrees Kelvin it
will be about red-white. That is the basis for light bulb color
temperature (but color temperature is actually based on radiation from a
"black body").

A tungsten filament at somewhere near 2700 degrees Kelvin will have a
color temperature of 2700.

A CFL with a color temperature of 5000 is nowhere near 5000 degrees
Kelvin. The color is produced by exciting phosphors.

Color temperature for these lamps is irrelevant to the heat dissipation.

What is of interest is the heat (IR) that is produced by lamps.

According to Don Klipstein, who used to post here, the heat produced by
CFLs does not radiate as well as the heat produced by incandescents in
an enclosed fixture. IMHO it is very unlikely that Don is wrong - he is
very good on lighting.

I tried to guess why that is true. My guess is that CFLs produce IR at
the longer wavelength end of the IR band, while incandescents produce IR
at the shorter end of the IR band (nearer red). And further that the
longer wavelength heat from CFLs does not radiate as well as the shorter
wavelength IR from incandescents. Which may mean the fixture glass
absorbs or reflects more of he longer wavelength IR.

On Wednesday, January 15, 2014 10:08:34 AM UTC-6, wrote:
Light fixtures all have a MAXimum wattage rating for bulb size. Most

standard indoor home fixtures are rated at 100W or less. (60W is

common). But this rating is for incandescent bulbs, and based on how

much heat the fixture can handle. Yet, these days incandescent bulbs

are becoming rare in homes. But lets say a fixture is rated at 60W MAX.

A 60W *Equivalant* CFL bulb only uses around 15W. Does this mean that

the fixture could actually handle FOUR of these bulbs (if they would

fit)? Or is the limit still based on the *Equivalant* rating?



I doubt any fixture rated at 60W would have the room for FOUR CFL bulbs,

but what if I install a 150W *Equivalant* bulb, which only uses around

30W? I know it's all abotu heat, and a CFL dont get as hot as a

incandescent bulb, but they still do put out some heat.



I guess the ratings on fixtures are sort of obsolete, and I have not yet

seen a CFL or LED rating on even the newest fixtures. I can only assume

they are speaking about ACTUAL wattage consumption, regardless of bulb

type. Is this correct?

WATT is a power consumption - not a heat distribution unit.

On Mon, 20 Jan 2014 11:42:22 -0600, bud-- wrote:

On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

"Heat temperature"? OK, you've described the "black body temperature"
but WTF is "heat temperature"?

It is totally irrelevant to the heat that is dissipated from the lamp
(which is IR).

Now, WTF does that mean?

wrote:
Light fixtures all have a MAXimum wattage rating for bulb size. Most
standard indoor home fixtures are rated at 100W or less. (60W is


I just wanted to report, talking to brother yesterday. He had a cfl
failure, wher there was a lot of smoke as he entered the room. he shut It
off. Might have been a fire hazard. Was table lamp. I asked for info on
manufacturer. He said he could not see it, just some other markings. Don't
buy unmarked lamps ! I'll see if he threw it away.

I seem to prefer lamps in sealed housings.

Greg

On 1/20/2014 5:16 PM, wrote:
On Mon, 20 Jan 2014 11:42:22 -0600, bud-- wrote:

On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

"Heat temperature"? OK, you've described the "black body temperature"
but WTF is "heat temperature"?


Not my term, but Tony is likely referring to the color temperature (for
instance 2700 K) that is on incandescent, CFL and LED packages.

On Tue, 21 Jan 2014 10:23:48 -0600, bud-- wrote:

On 1/20/2014 5:16 PM, wrote:
On Mon, 20 Jan 2014 11:42:22 -0600, bud-- wrote:

On 1/19/2014 12:00 PM, wrote:
On Sun, 19 Jan 2014 09:59:01 -0700, Tony Hwang
wrote:

bud-- wrote:
On 1/16/2014 12:27 PM, Tony Hwang wrote:
bud-- wrote:
On 1/15/2014 1:37 PM, wrote:
On Wed, 15 Jan 2014 11:13:35 -0600, wrote:


In addition to that, I think Don Klipstein said the heat produced by
CFLs does not radiate out of the fixture as well as the heat from
incandescents.

Why would that be? Heat is heat!

Incandescents get a lot hotter than CFLs. A higher percentage of the IR
would be shorter wavelengths, closer to red. My guess is that the
Hi,
IR has longer wave length. Longer than red. Not short.

shorter wavelengths radiate better.


But hotter lamps likely produce more IR toward red which is shorter
wavelength end of the IR band. Cooler CFLs would likely have IR
emissions at the longer wavelength end of the IR band.
Hi,
Just look at heat temperature. CFL is higher than incandescent ones
always. So what you are saying does not make sense.

Speaking of nonsense. WTF is "heat temperature"?


It is the Kelvin temperature rating of the light source (visible light).
Incandescents may be 2700 degrees Kelvin.

"Heat temperature"? OK, you've described the "black body temperature"
but WTF is "heat temperature"?


Not my term, but Tony is likely referring to the color temperature (for
instance 2700 K) that is on incandescent, CFL and LED packages.

Other people were writing that but he wasn't making any sense.