josephkk wrote:

On Mon, 30 Jul 2012 09:25:15 +0100, Martin Brown
wrote:

On 30/07/2012 03:25, Jim Thompson wrote:
On Mon, 30 Jul 2012 10:15:48 +1000, "David Eather"
wrote:

On Mon, 30 Jul 2012 09:53:26 +1000, Jim Thompson
wrote:

Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Technically the incandescent. The both consume 40 watts but the halogen is
more efficient at converting power to light (and hence not to heat). I
said 'technically' because you are unlikely to notice the difference in
heat.

There are two forms of heat involved here. Thermal radiation and warm
air the relative proportions vary with the type of lamp.

You haven't defined what you mean by "heat" but taking it to be
thermally damaging radiation capable of scorching lampshades.

The *peak* emission even of the quartz halogen lamp is still in the near
infrared even for a halogen bulb run at 3300K so the flux of thermal IR
from a quartz halogen is more likely to start fires. The small red hot
envelope and tendency to explode adds to the excitement.

More short wave visible photons are emitted by the quartz halogen
filament at a higher temperature but well over half of them are high
temperature thermal IR (anything characteristic of 600K and above).

http://zeiss-campus.magnet.fsu.edu/a...enhalogen.html

Has graphs of the BB radiation curves for 2500K through 3300K.
This applet will let you plot some suitable curves as a function of
temperature set Tmax=3300 (tungsten isn't quite a black body)

http://www.phy.ntnu.edu.tw/ntnujava/...p?topic=1037.0

Mains quartz halogens come with a warning that they are unsuitable for
desk lamps in part for this reason (they are double glass envelope).

Once it has thermalised in the room 40W total dissipation is 40W of heat
ignoring any light that escapes out of the windows. You can feel the
beam of heat radiation from a directional quartz halogen fitting.

More light and heat radiation is emitted from a quartz halogen lamp as a
proportion of the electricity consumed and a higher percentage is at
visible wavelengths but the peak emission is still around 900nm.

An ordinary filament lamp loses a larger proportion of its heat by
convection of warm air from the physically larger but cooler glass envelope.

My thoughts, too. I have a fixture rated for three 40W miniature base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

Well if you want to set fire to the lampshades and burn your house down
go right ahead. I take it you flunked physics at MIT.

Geez. Did you do anything to validate the junk on those two sites?
Tungsten photofloods at 3200 k and 3400 k have been available for over 50
years. I can buy halogen lamps with operating temperatures as high as
5700 k, for my car even. Take a look at Plank's law for energy
distribution and Wein's law for spectral peak.

http://egglescliffe.org.uk/physics/a...ody/bbody.html

?-)

Tungsten melts at about 3700K, and boils at about 5800. Non-halogen
photofloods had very short lives--like 20 hours--and darkened very
significantly by about 10 hours. (I used them back in the 1970s when I
worked in a camera store.) Halogen ones last longer, because the high
gas pressure inside reduces filament evaporation.

I invite you to investigate the difference between colour temperature
and thermodynamic temperature. The emissivity of hot tungsten is
slightly lower in the IR than in the visible, so its colour temperature
is about 100K higher than its thermodynamic temperature, but the actual
filament doesn't get above 3300K.

Higher colour temperatures are obtained by using blue filters, i.e. by
absorbing a lot of the red and yellow. Not how you get

If there were any solid objects that could stand 5700K, incandescents
would win the luminous efficacy contest, and the greenies would have to
prop up their shaky self-worth by disapproving of us for something else.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

On Tue, 31 Jul 2012 15:36:30 +1000, wrote:

On Tue, 31 Jul 2012 10:33:55 +1000, "David Eather"
wrote:

My thoughts, too. I have a fixture rated for three 40W miniature base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

So you want to upgrade three 450 lm sources with three 750 lm sources.

I'm not sure exactly what you're after but maybe one of these would be
about right

http://dx.com/p/3w-300-lumen-6500k-w...-86-265v-56233
http://dx.com/p/e14-3500k-3w-260-lum...-85-245v-81197
http://dx.com/p/e14-3w-3-led-240-lum...-35579?item=15
http://dx.com/p/e14-3w-260-lumen-700...-47970?item=17

There is a ship load of them and running them save you money.

So you are suggesting using three 240 lm sources instead, which does
not make much sense. Thus, the number of lamps would have to be
doubled or tripled, i.e. a new light fixture would be required.

It should be noted that "white" 6500-7000 K LEDs have a strong narrow
blue spectral line and some broadband yellow and red emission, not
very compatible with existing incandescent light bulbs in the room.


There are shot loads of LED lamps in all colors. If you don't like white,
then warm white. If these aren't bright enough then there are others, all
the way to 20 watt flood lamps.

Don't be a ******.
--
Using Opera's revolutionary email client: http://www.opera.com/mail/

On Wed, 01 Aug 2012 06:14:08 +1000, "David Eather"
wrote:

On Tue, 31 Jul 2012 15:36:30 +1000, wrote:

On Tue, 31 Jul 2012 10:33:55 +1000, "David Eather"
wrote:

My thoughts, too. I have a fixture rated for three 40W miniature base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

So you want to upgrade three 450 lm sources with three 750 lm sources.

I'm not sure exactly what you're after but maybe one of these would be
about right

http://dx.com/p/3w-300-lumen-6500k-w...-86-265v-56233
http://dx.com/p/e14-3500k-3w-260-lum...-85-245v-81197
http://dx.com/p/e14-3w-3-led-240-lum...-35579?item=15
http://dx.com/p/e14-3w-260-lumen-700...-47970?item=17

There is a ship load of them and running them save you money.

So you are suggesting using three 240 lm sources instead, which does
not make much sense. Thus, the number of lamps would have to be
doubled or tripled, i.e. a new light fixture would be required.

It should be noted that "white" 6500-7000 K LEDs have a strong narrow
blue spectral line and some broadband yellow and red emission, not
very compatible with existing incandescent light bulbs in the room.


There are shot loads of LED lamps in all colors. If you don't like white,
then warm white. If these aren't bright enough then there are others, all
the way to 20 watt flood lamps.

Could you please give a link to lamp with E14 base producing at least
400 lm or one with E27 base with at least 700 lm and with Ra 90 (in
order to be a direct replacement for 40 W E14 or 60 W E27 bulbs).

If such lamps do not exist, how about at least Ra 80 ?

I have nothing against truly white light, I use about a dozen T8
fluorescent 18 W/940 and /965 tubes (Ra 90, with 4000 K or 6500
colour temperature) for indirect lighting.

10-20 W LED lamps tend to be quite exotic with fan or liquid cooling
and Ra in the low 70's :-)

Don't be a ******.

Have a nice day, sir.

On Wed, 01 Aug 2012 00:49:15 +0300, wrote:

On Wed, 01 Aug 2012 06:14:08 +1000, "David Eather"
wrote:

On Tue, 31 Jul 2012 15:36:30 +1000, wrote:

On Tue, 31 Jul 2012 10:33:55 +1000, "David Eather"
wrote:

My thoughts, too. I have a fixture rated for three 40W miniature base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

So you want to upgrade three 450 lm sources with three 750 lm sources.

I'm not sure exactly what you're after but maybe one of these would be
about right

http://dx.com/p/3w-300-lumen-6500k-w...-86-265v-56233
http://dx.com/p/e14-3500k-3w-260-lum...-85-245v-81197
http://dx.com/p/e14-3w-3-led-240-lum...-35579?item=15
http://dx.com/p/e14-3w-260-lumen-700...-47970?item=17

There is a ship load of them and running them save you money.

So you are suggesting using three 240 lm sources instead, which does
not make much sense. Thus, the number of lamps would have to be
doubled or tripled, i.e. a new light fixture would be required.

It should be noted that "white" 6500-7000 K LEDs have a strong narrow
blue spectral line and some broadband yellow and red emission, not
very compatible with existing incandescent light bulbs in the room.


There are shot loads of LED lamps in all colors. If you don't like white,
then warm white. If these aren't bright enough then there are others, all
the way to 20 watt flood lamps.

Could you please give a link to lamp with E14 base producing at least
400 lm or one with E27 base with at least 700 lm and with Ra 90 (in
order to be a direct replacement for 40 W E14 or 60 W E27 bulbs).

If such lamps do not exist, how about at least Ra 80 ?

I have nothing against truly white light, I use about a dozen T8
fluorescent 18 W/940 and /965 tubes (Ra 90, with 4000 K or 6500
colour temperature) for indirect lighting.

10-20 W LED lamps tend to be quite exotic with fan or liquid cooling
and Ra in the low 70's :-)

Don't be a ******.

Have a nice day, sir.

I have 25W-equivalent LED "bulbs" out in the front entry court
lights... you can't tell them from incandescent.

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

On Tue, 31 Jul 2012 10:37:45 -0400, Phil Hobbs
wrote:

josephkk wrote:

On Mon, 30 Jul 2012 09:25:15 +0100, Martin Brown
wrote:

On 30/07/2012 03:25, Jim Thompson wrote:
On Mon, 30 Jul 2012 10:15:48 +1000, "David Eather"
wrote:

On Mon, 30 Jul 2012 09:53:26 +1000, Jim Thompson
wrote:

Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Technically the incandescent. The both consume 40 watts but the halogen is
more efficient at converting power to light (and hence not to heat). I
said 'technically' because you are unlikely to notice the difference in
heat.

There are two forms of heat involved here. Thermal radiation and warm
air the relative proportions vary with the type of lamp.

You haven't defined what you mean by "heat" but taking it to be
thermally damaging radiation capable of scorching lampshades.

The *peak* emission even of the quartz halogen lamp is still in the near
infrared even for a halogen bulb run at 3300K so the flux of thermal IR
from a quartz halogen is more likely to start fires. The small red hot
envelope and tendency to explode adds to the excitement.

More short wave visible photons are emitted by the quartz halogen
filament at a higher temperature but well over half of them are high
temperature thermal IR (anything characteristic of 600K and above).

http://zeiss-campus.magnet.fsu.edu/a...nhalogen..html

Has graphs of the BB radiation curves for 2500K through 3300K.
This applet will let you plot some suitable curves as a function of
temperature set Tmax=3300 (tungsten isn't quite a black body)

http://www.phy.ntnu.edu.tw/ntnujava/...p?topic=1037.0

Mains quartz halogens come with a warning that they are unsuitable for
desk lamps in part for this reason (they are double glass envelope).

Once it has thermalised in the room 40W total dissipation is 40W of heat
ignoring any light that escapes out of the windows. You can feel the
beam of heat radiation from a directional quartz halogen fitting.

More light and heat radiation is emitted from a quartz halogen lamp as a
proportion of the electricity consumed and a higher percentage is at
visible wavelengths but the peak emission is still around 900nm.

An ordinary filament lamp loses a larger proportion of its heat by
convection of warm air from the physically larger but cooler glass envelope.

My thoughts, too. I have a fixture rated for three 40W miniature base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

Well if you want to set fire to the lampshades and burn your house down
go right ahead. I take it you flunked physics at MIT.

Geez. Did you do anything to validate the junk on those two sites?
Tungsten photofloods at 3200 k and 3400 k have been available for over 50
years. I can buy halogen lamps with operating temperatures as high as
5700 k, for my car even. Take a look at Plank's law for energy
distribution and Wein's law for spectral peak.

http://egglescliffe.org.uk/physics/a...ody/bbody.html

?-)

Tungsten melts at about 3700K, and boils at about 5800. Non-halogen
photofloods had very short lives--like 20 hours--and darkened very
significantly by about 10 hours. (I used them back in the 1970s when I
worked in a camera store.) Halogen ones last longer, because the high
gas pressure inside reduces filament evaporation.

I invite you to investigate the difference between colour temperature
and thermodynamic temperature. The emissivity of hot tungsten is
slightly lower in the IR than in the visible, so its colour temperature
is about 100K higher than its thermodynamic temperature, but the actual
filament doesn't get above 3300K.

Higher colour temperatures are obtained by using blue filters, i.e. by
absorbing a lot of the red and yellow. Not how you get

If there were any solid objects that could stand 5700K, incandescents
would win the luminous efficacy contest, and the greenies would have to
prop up their shaky self-worth by disapproving of us for something else.

Cheers

Phil Hobbs


Well at lest i got proven to be stupid by someone i respect.

?-)

Bill Martin wrote:
On 07/30/2012 07:45 AM, Jim Thompson wrote:


Me? I was on Dean's List.


...Jim Thompson


Oh, I know it's none of my business..but this so begs the question:
"Which one?" :-)

Both, I suspect.

As in the case of a conversation between my dentist and another patient:

DENTIST: My daughter's dating an honor student.

PATIENT: Uh, doctor, you and I were honor students too, remember?

....pause...

DENTIST: I'll kill him.


--

Reply in group, but if emailing add one more
zero, and remove the last word.

On Tue, 31 Jul 2012 23:32:34 -0400, "Tom Del Rosso"
wrote:


Bill Martin wrote:
On 07/30/2012 07:45 AM, Jim Thompson wrote:


Me? I was on Dean's List.


...Jim Thompson


Oh, I know it's none of my business..but this so begs the question:
"Which one?" :-)

Both, I suspect.

As in the case of a conversation between my dentist and another patient:

DENTIST: My daughter's dating an honor student.

PATIENT: Uh, doctor, you and I were honor students too, remember?

...pause...

DENTIST: I'll kill him.

The most difficult part of being a father is being a father to
daughters... and realizing that the guy coming up the walkway has the
same thing on his mind that you did when you were 18 ;-)

I gained an attorney and a Honeywell executive, but it was rough
keeping from killing them while they came of age :-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

josephkk wrote:

On Tue, 31 Jul 2012 10:37:45 -0400, Phil Hobbs
wrote:

josephkk wrote:

On Mon, 30 Jul 2012 09:25:15 +0100, Martin Brown
wrote:

On 30/07/2012 03:25, Jim Thompson wrote:
On Mon, 30 Jul 2012 10:15:48 +1000, "David Eather"
wrote:

On Mon, 30 Jul 2012 09:53:26 +1000, Jim Thompson
wrote:

Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Technically the incandescent. The both consume 40 watts but the halogen is
more efficient at converting power to light (and hence not to heat). I
said 'technically' because you are unlikely to notice the difference in
heat.

There are two forms of heat involved here. Thermal radiation and warm
air the relative proportions vary with the type of lamp.

You haven't defined what you mean by "heat" but taking it to be
thermally damaging radiation capable of scorching lampshades.

The *peak* emission even of the quartz halogen lamp is still in the near
infrared even for a halogen bulb run at 3300K so the flux of thermal IR
from a quartz halogen is more likely to start fires. The small red hot
envelope and tendency to explode adds to the excitement.

More short wave visible photons are emitted by the quartz halogen
filament at a higher temperature but well over half of them are high
temperature thermal IR (anything characteristic of 600K and above).

http://zeiss-campus.magnet.fsu.edu/a...enhalogen.html

Has graphs of the BB radiation curves for 2500K through 3300K.
This applet will let you plot some suitable curves as a function of
temperature set Tmax=3300 (tungsten isn't quite a black body)

http://www.phy.ntnu.edu.tw/ntnujava/...p?topic=1037.0

Mains quartz halogens come with a warning that they are unsuitable for
desk lamps in part for this reason (they are double glass envelope).

Once it has thermalised in the room 40W total dissipation is 40W of heat
ignoring any light that escapes out of the windows. You can feel the
beam of heat radiation from a directional quartz halogen fitting.

More light and heat radiation is emitted from a quartz halogen lamp as a
proportion of the electricity consumed and a higher percentage is at
visible wavelengths but the peak emission is still around 900nm.

An ordinary filament lamp loses a larger proportion of its heat by
convection of warm air from the physically larger but cooler glass envelope.

My thoughts, too. I have a fixture rated for three 40W miniature base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

Well if you want to set fire to the lampshades and burn your house down
go right ahead. I take it you flunked physics at MIT.

Geez. Did you do anything to validate the junk on those two sites?
Tungsten photofloods at 3200 k and 3400 k have been available for over 50
years. I can buy halogen lamps with operating temperatures as high as
5700 k, for my car even. Take a look at Plank's law for energy
distribution and Wein's law for spectral peak.

http://egglescliffe.org.uk/physics/a...ody/bbody.html

?-)

Tungsten melts at about 3700K, and boils at about 5800. Non-halogen
photofloods had very short lives--like 20 hours--and darkened very
significantly by about 10 hours. (I used them back in the 1970s when I
worked in a camera store.) Halogen ones last longer, because the high
gas pressure inside reduces filament evaporation.

I invite you to investigate the difference between colour temperature
and thermodynamic temperature. The emissivity of hot tungsten is
slightly lower in the IR than in the visible, so its colour temperature
is about 100K higher than its thermodynamic temperature, but the actual
filament doesn't get above 3300K.

Higher colour temperatures are obtained by using blue filters, i.e. by
absorbing a lot of the red and yellow. Not how you get

If there were any solid objects that could stand 5700K, incandescents
would win the luminous efficacy contest, and the greenies would have to
prop up their shaky self-worth by disapproving of us for something else.

Cheers

Phil Hobbs

Well at lest i got proven to be stupid by someone i respect.

?-)

Nah, I get confused all the time. I spent a big chunk of today trying
to figure out a tweak to linearize the Vbe of a biased Darlington, and
then realized I'd done something almost exactly similar for a customer
about six weeks ago.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net

Jim Thompson wrote:

The most difficult part of being a father is being a father to
daughters... and realizing that the guy coming up the walkway has the
same thing on his mind that you did when you were 18 ;-)

I gained an attorney and a Honeywell executive, but it was rough
keeping from killing them while they came of age :-)


There was a father with three daughters, and they all had dates one night.
The first guy knocked on the door and the father answered.

The guy said, "Hi, I'm Freddie. I'm here to pick up Betty. We're going out
for spaghetti. Is she ready?"

The father thought he looked like a good kid, so Freddie left with Betty.

Another knocked on the door.

The guy said, "My name is Joe. I'm here for Flo. We're going to a show.
Is she ready to go?"

The father thought he looked ok, so Joe and Flo left.

The third guy knocked on the door.

The guy said, "My name is Chuck-" and the father shot him.


--

Reply in group, but if emailing add one more
zero, and remove the last word.

On Wed, 01 Aug 2012 07:49:15 +1000, wrote:

On Wed, 01 Aug 2012 06:14:08 +1000, "David Eather"
wrote:

On Tue, 31 Jul 2012 15:36:30 +1000, wrote:

On Tue, 31 Jul 2012 10:33:55 +1000, "David Eather"
wrote:

My thoughts, too. I have a fixture rated for three 40W miniature
base
incandescents, presently loaded with three 40W Halogens. My
temptation is to go up to three 60W Halogens.

...Jim Thompson

So you want to upgrade three 450 lm sources with three 750 lm sources.

I'm not sure exactly what you're after but maybe one of these would be
about right

http://dx.com/p/3w-300-lumen-6500k-w...-86-265v-56233
http://dx.com/p/e14-3500k-3w-260-lum...-85-245v-81197
http://dx.com/p/e14-3w-3-led-240-lum...-35579?item=15
http://dx.com/p/e14-3w-260-lumen-700...-47970?item=17

There is a ship load of them and running them save you money.

So you are suggesting using three 240 lm sources instead, which does
not make much sense. Thus, the number of lamps would have to be
doubled or tripled, i.e. a new light fixture would be required.

It should be noted that "white" 6500-7000 K LEDs have a strong narrow
blue spectral line and some broadband yellow and red emission, not
very compatible with existing incandescent light bulbs in the room.


There are shot loads of LED lamps in all colors. If you don't like
white,
then warm white. If these aren't bright enough then there are others,
all
the way to 20 watt flood lamps.

Could you please give a link to lamp with E14 base producing at least
400 lm or one with E27 base with at least 700 lm and with Ra 90 (in
order to be a direct replacement for 40 W E14 or 60 W E27 bulbs).

If such lamps do not exist, how about at least Ra 80 ?

I have nothing against truly white light, I use about a dozen T8
fluorescent 18 W/940 and /965 tubes (Ra 90, with 4000 K or 6500
colour temperature) for indirect lighting.

10-20 W LED lamps tend to be quite exotic with fan or liquid cooling
and Ra in the low 70's :-)

Don't be a ******.

Have a nice day, sir.


Some of these might be right - I didn't search very hard.

450 - 500 lm e14 - white and warm white

http://dx.com/p/e14-5w-450-500lm-600...-55444?item=24
http://dx.com/p/e14-5w-450-500lm-300...-55442?item=32

this is close with the candle shape

http://dx.com/p/e14-4-2w-400-lumen-3...23547?item=143

but if none of them work then this

http://dx.com/p/e27-to-e14-light-lam...-103388?item=1

plus one of these:

http://dx.com/p/e27-12w-1000-lumen-l...52218?item=105
http://dx.com/p/e27-10w-6500k-1100-l...73205?item=140

probably will.


--
Using Opera's revolutionary email client: http://www.opera.com/mail/

On 30/7/2012 7:53 AM, Jim Thompson wrote:
Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Heat is Energy , measurable in Watts, hence they must both produce the
exact same quantity of heat, neglecting differences in nuclear resonance
energies.

Please send beer prize soon ....

On Tue, 21 Aug 2012 04:59:00 +0800, Jalil - Natural Systems
wrote:

On 30/7/2012 7:53 AM, Jim Thompson wrote:
Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Heat is Energy , measurable in Watts,

The W is a unit of power (energy per unit time), not energy.

No free beer for you.

On 21/8/2012 5:50 AM, Spehro Pefhany wrote:
On Tue, 21 Aug 2012 04:59:00 +0800, Jalil - Natural Systems
wrote:

On 30/7/2012 7:53 AM, Jim Thompson wrote:
Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Heat is Energy , measurable in Watts,

The W is a unit of power (energy per unit time), not energy.

No free beer for you.

From Kiwi :-
The watt (play /ˈwɒt/ WOT; symbol: W) is a derived unit of power in the
International System of Units (SI), named after the Scottish engineer
James Watt (1736€“1819). The unit, defined as one joule per second,
measures the rate of energy conversion or transfer.

okay, so we have Joules per Second (J/s). And i suppose X seconds of 40W
of Incandescent is not equal to X seconds of 40W of Halogen ?

Hurry up with the free beer :;

Jalil - Natural Systems wrote:
On 21/8/2012 5:50 AM, Spehro Pefhany wrote:
On Tue, 21 Aug 2012 04:59:00 +0800, Jalil - Natural Systems
wrote:

On 30/7/2012 7:53 AM, Jim Thompson wrote:
Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Heat is Energy , measurable in Watts,

The W is a unit of power (energy per unit time), not energy.

No free beer for you.

From Kiwi :-
The watt (play /ˈwɒt/ WOT; symbol: W) is a derived unit of power in the
International System of Units (SI), named after the Scottish engineer
James Watt (1736€“1819). The unit, defined as one joule per second,
measures the rate of energy conversion or transfer.

okay, so we have Joules per Second (J/s). And i suppose X seconds of 40W
of Incandescent is not equal to X seconds of 40W of Halogen ?

Hurry up with the free beer :;


The Halogen lamps are roughly 100% more efficient - same illumination
for half the consumed power.

On 22/8/2012 5:37 AM, Robert Baer wrote:
Jalil - Natural Systems wrote:
On 21/8/2012 5:50 AM, Spehro Pefhany wrote:
On Tue, 21 Aug 2012 04:59:00 +0800, Jalil - Natural Systems
wrote:

On 30/7/2012 7:53 AM, Jim Thompson wrote:
Loony Question for Today...

Which produces more HEAT, a 40W Incandescent, or a 40W Halogen bulb?

...Jim Thompson

Heat is Energy , measurable in Watts,

The W is a unit of power (energy per unit time), not energy.

No free beer for you.

From Kiwi :-
The watt (play /ˈwɒt/ WOT; symbol: W) is a derived unit of power in the
International System of Units (SI), named after the Scottish engineer
James Watt (1736€“1819). The unit, defined as one joule per second,
measures the rate of energy conversion or transfer.

okay, so we have Joules per Second (J/s). And i suppose X seconds of 40W
of Incandescent is not equal to X seconds of 40W of Halogen ?

Hurry up with the free beer :;


The Halogen lamps are roughly 100% more efficient - same illumination
for half the consumed power.
Aw c'mon.The question was which of them produces more HEAT !, not which
is more efficient !

In a closed system, obeying laws of conservation of energy, i.e. no heat
losses, that would translate into exactly the same amount of HEAT.

Pah! It's awful what one has to go through just for a free beer nowadays !