(Don Klipstein) wrote in
:

Lumens out per watt in varies widely among incandescents.

For example, a Sylvania 75W "standard" incandescent available at Lowes
outshines a Sunbeam 100 watt one available at some dollar stores.

Yes, indeed. For incandescents my MO used to be: #1 go for the most
lumens per watt. #2 for the top 3 or 4 compare life expectancy. Make your
decision.

That was then. Recently things got more complicated because reliability of
CFLs was initially rather poor and the price high. That's better now, but
the advent of all kinds of different LEDs makes a real jumble out of all
those comparisons, not to speak of the pricing problems. I did buy a 3 LED
light for undercabinet over the counter lighting, and like the result (not
the price): Utilitech 18" 3-Light Linking LED Bar, my price was $39.98, it
is now $3 more on line at Lowe's

--
Best regards
Han
email address is invalid

"Ed Pawlowski" wrote in
news
W/lumen gives a
relative number but not as useful.

W consumed per lumen output seems a good measure to me. Or rather the
inverse, lumen/watt. The higher that number, the better (for me). Of
course, how pleasing is the light, and acquisition cost make a difference
too.

--
Best regards
Han
email address is invalid

On Sun, 22 May 2011 16:05:47 +0000 (UTC), (Don Klipstein)
wrote:

In , zzzzzzz wrote:
On 21 May 2011 23:12:02 -0400, "Ed Pawlowski" wrote:


wrote
wrote in

Sorry, but the fellow who told me that is a life-long EE, and one of the
world's leading laser experts. While watts as used in connection with
incandescent lamps has always referred to consumption, the light output
can also apparently be measured in watts. I choose to believe my friend,
whom I've known and respected for 10 years, on this score.

Absolutely. Watts-out/watts-in gives efficiency directly. W/lumen
gives
a
relative number but not as useful.

But what does efficiency have to do with brightness? He may be
technically
correct, but how can a consumer tell what he is getting?

Visible energy out is the whole point of a light bulb, isn't it?

Say one bulb is 100 watts in, 65 watt out, it would be 65% efficient.

Ok...

Another bulb is 50 watts in, 49 watts out, it would be more efficient, but
not as bright.

Do you want a 49 watt out bulb or a 65 watt out bulb? If you only need 49W
of
illumination, certainly you would buy the smaller bulb.

The poster said the EE stated efficiency was the determining factor.
Therefore, he says the 49 watt output is what counts because it is more
efficient. He states that lumens is not useful. I say BS.

This guy may be a genius, but cannot explain his theory to us commoners. Or
a whole lot of fact was left out. I don't care how efficient a lamp is, if
it is not bright enough, I'm getting a bigger one. More watts = more light.

I read it as lumens didn't say anything about efficiency. Watts out does
(since watts in is also stated). Lumens per watt means something but doesn't
tell me anything about efficiency. 100W in, 3W out (about right for an
incandescent) says it all.

Lumens out per watt in varies widely among incandescents.

Of course it does! That's the whole point! Where did that come from?

For example, a Sylvania 75W "standard" incandescent available at Lowes
outshines a Sunbeam 100 watt one available at some dollar stores.

So what?! That has *NOTHING* to do with the issue.

On Sun, 22 May 2011 12:13:11 -0400, "Ed Pawlowski" wrote:


"Smitty Two" wrote in message
news
In article ,
"Ed Pawlowski" wrote:

The poster said the EE stated efficiency was the determining factor.
Therefore, he says the 49 watt output is what counts because it is more
efficient. He states that lumens is not useful. I say BS.

Which poster said that?

I may have interpreted that incorrectly It was between your friend's
statement and krw's reply that lumens are not as useful as efficiency.
My point is, though, efficiency is not as meaningful as actual light output,
no matter the measurement method.

Yes, if you measure the power in the (visible) light output you have *both*
the light output *AND* the efficiency (watts in is already stated).

Sorry, but the fellow who told me that is a life-long EE, and one of the
world's leading laser experts. While watts as used in connection with
incandescent lamps has always referred to consumption, the light output
can also apparently be measured in watts. I choose to believe my friend,
whom I've known and respected for 10 years, on this score.

Absolutely. Watts-out/watts-in gives efficiency directly. W/lumen gives a
relative number but not as useful.

Watts-in/watts-out also shows how inefficient light bulbs really are and give
an incentive to increase efficiency. Maybe more reason for people to switch
(not enough for me, though ;-).

RonB wrote:
On May 20, 11:30 pm, Sam wrote:
Hi,

What's the brightness (let's say per foot) of the L.E.D. rope lights in
incandescent-light-watt-equivalent?

Thanks,

Sam

Cannot tell you what the brightness numbers are per foot. What is
your application. We have used short runs pretty effectively in some
museum display cases where we wanted indirect lights. It is best to
keep them out of sight with simple baffles.

RonB
Hi,
When I visited a museum in Shanghai China some of artifacts display case
had auto dimming light. When there is no one near the case the light
dimmed very low, when some one approaches it goes back to normal
brightness to save energy as well as cause minimal harmful effects on
the item which is VERY old.

On May 22, 12:13*pm, "Ed Pawlowski" wrote:
"Smitty Two" wrote in message

news
In article ,
"Ed Pawlowski" wrote:

The poster said the EE stated efficiency was the determining factor.
Therefore, he says the 49 watt output is what counts because it is more
efficient. *He states that lumens is not useful. * I say BS.

Which poster said that?

I may have interpreted that incorrectly *It was between your friend's
statement and krw's reply that lumens are not as useful as efficiency.
My point is, though, efficiency is not as meaningful as actual light output,
no matter the measurement method.

Sorry, but the fellow who told me that is a life-long EE, and one of the
world's leading laser experts. While watts as used in connection with
incandescent lamps has always referred to consumption, the light output
can also apparently be measured in watts. I choose to believe my friend,
whom I've known and respected for 10 years, on this score.

Absolutely. *Watts-out/watts-in gives efficiency directly. *W/lumen gives a
relative number but not as useful.

WHAT A BUNCH OF PANSIES...PEOPLE JUST WANT GOOD LIGHTING.
THOUGH LED LIGHTING IS EFFICIENT AND BRIGHT FOR THE MONEY IN MY
EXPERIENCE MOST PEOPLE DONT CARE IF THEY ARE GETTING MORE LUMINOUS
BANG FOR THEIR BUCK JUST AS LONG AS THEY GET THE BRIGHTNESS THEY NEED
IN A SPECIFIC LOCATION...IN OTHER WORDS, HAD THEY NOT INVENTED CFLS
AND LED LIGHTING, THEY WOULD BE JUST FINE USING 100 WATT BULBS
EVERYWHERE THEY NEEDED THE BRIGHTEST LEVEL OF LIGHTING.

THIS IS NOT A SCIENCE OR ENGINEERING GROUP TO DELVE INTO THE DETAILS
OF HOW & WHY THEY ARE BETTER..THE AVERAGE HOME OWNER OR UTILITY
CUSTOMER COULD CARE LESS IF LIGHTNING BUGS WHERE INSIDE THE WORKS, AS
LONG AS IT LIGHTS UP THEIR HOME JUST AS THEY WANT IT.

TGITM
PAT ECUM

Who are you talking to? Yourself?

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


"The Henchman" wrote in message
...


Why are you shouting at him??????