Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescent_replacement_lighting_tube_from_LedFX

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescen...

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescent_replacement_lighting_tube_from_LedFX

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

On Wed, 13 Feb 2008 19:46:55 -0500, Victor Roberts





x...@lighting-research.com> wrote:
On Tue, 12 Feb 2008 11:28:13 -0800 (PST), Boxman
box...@voyager.net> wrote:

Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescen...

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

The DOE just released Round 4 summary test results for LED
luminaires and replacement lamps that included an LED-based
replacement for T8 fluorescent lamps.  The efficacy of the
tested lamp was 48 lm/W.  I will not be able to tell if this
is the same lamp as you mention until I get the detailed
test data which will take a few more days.

The data was obtained under the DOE's CALiPER program.  The
Round 4 summary data is here:

http://www.netl.doe.gov/ssl/PDFs/CALIPERROUND4summaryFINAL.pdf

Anyone can sign up to get the detailed test data if you
agree to the DOE's terms of use.

I've received my copy of the DOE CALiPER test data.  The T8
lamp they tested was the EverLED E25-T8-48-TR, Neutral.

--
Vic Robertshttp://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.

This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission.- Hide quoted text -

- Show quoted text -

On Tue, 12 Feb 2008 11:28:13 -0800 (PST), Boxman
boxman@voyager.net> wrote:

Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescent_replacement_lighting_tube_from_LedFX

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

The DOE just released Round 4 summary test results for LED
luminaires and replacement lamps that included an LED-based
replacement for T8 fluorescent lamps. The efficacy of the
tested lamp was 48 lm/W. I will not be able to tell if this
is the same lamp as you mention until I get the detailed
test data which will take a few more days.

The data was obtained under the DOE's CALiPER program. The
Round 4 summary data is here:

http://www.netl.doe.gov/ssl/PDFs/CALIPERROUND4summaryFINAL.pdf

Anyone can sign up to get the detailed test data if you
agree to the DOE's terms of use.

On Feb 15, 1:08 pm, Victor Roberts <x...@lighting-research.com> wrote:





On Wed, 13 Feb 2008 19:46:55 -0500, Victor Roberts

x...@lighting-research.com> wrote:
On Tue, 12 Feb 2008 11:28:13 -0800 (PST), Boxman
box...@voyager.net> wrote:

Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescen....

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

The DOE just released Round 4 summary test results for LED
luminaires and replacement lamps that included an LED-based
replacement for T8 fluorescent lamps.  The efficacy of the
tested lamp was 48 lm/W.  I will not be able to tell if this
is the same lamp as you mention until I get the detailed
test data which will take a few more days.

The data was obtained under the DOE's CALiPER program.  The
Round 4 summary data is here:

http://www.netl.doe.gov/ssl/PDFs/CALIPERROUND4summaryFINAL.pdf

Anyone can sign up to get the detailed test data if you
agree to the DOE's terms of use.

I've received my copy of the DOE CALiPER test data.  The T8
lamp they tested was the EverLED E25-T8-48-TR, Neutral.

--
Vic Robertshttp://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.

This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission.- Hide quoted text -

- Show quoted text -

Thanks for the info Vic.  The DOE link was especially useful.- Hide quoted text -

- Show quoted text -

On Feb 15, 9:24 pm, Boxman <box...@voyager.net> wrote:
On Feb 15, 1:08 pm, Victor Roberts <x...@lighting-research.com> wrote:





On Wed, 13 Feb 2008 19:46:55 -0500, Victor Roberts

x...@lighting-research.com> wrote:
On Tue, 12 Feb 2008 11:28:13 -0800 (PST), Boxman
box...@voyager.net> wrote:

Anybdody seen any of these lamps?

http://www.selector.com/company/LedFX/news/11022008/T8_LED_fluorescen...

The specs show an efficacy of 100 lumens/watt which seems surprising,
however they do appear to be using a large amount of low output leds.
I wonder what the cost is and whether the color is uniform through the
whole beam?

The DOE just released Round 4 summary test results for LED
luminaires and replacement lamps that included an LED-based
replacement for T8 fluorescent lamps.  The efficacy of the
tested lamp was 48 lm/W.  I will not be able to tell if this
is the same lamp as you mention until I get the detailed
test data which will take a few more days.

The data was obtained under the DOE's CALiPER program.  The
Round 4 summary data is here:

http://www.netl.doe.gov/ssl/PDFs/CALIPERROUND4summaryFINAL.pdf

Anyone can sign up to get the detailed test data if you
agree to the DOE's terms of use.

I've received my copy of the DOE CALiPER test data.  The T8
lamp they tested was the EverLED E25-T8-48-TR, Neutral.

--
Vic Robertshttp://www.RobertsResearchInc.com
To reply via e-mail:
replace xxx with vdr in the Reply to: address
or use e-mail address listed at the Web site.

This information is provided for educational purposes only.
It may not be used in any publication or posted on any Web
site without written permission.- Hide quoted text -

- Show quoted text -

Thanks for the info Vic.  The DOE link was especially useful.- Hide quoted text -

- Show quoted text -

That was a very useful link, thanks.

Kind of a dumb question, I guess, but: They are quoting an efficacy
of 42 lm/W for a drop in T8 replacement, compared to the fluorescent
at 50 to 95. 42 is higher than I thought we could get out of LEDs, I
guess they are greatly improved. But they go on to say that the
lumens come out 360 degrees from the fluourescent, so it's actual
efficacy is less.

Less? How much less? Seems like a scientific study would have said
10% less, 90% less, etc., rather than leaving it that vague.

Are we comparing apples to oranges? Measuring the light coming down
from an LED fixture, and comparing it to a fluourescent not in a
fixture?

This isn't idle curiousity, I am often involved in reviewing
construction specifications and I'm being pushed to use the latest
energy savings devices, I like to be sure they are real.

I've seen some LED product that shines in only one direction, even
though it is intended as a T8 replacement.

This would naturally screw-up standard figures for fixture efficency.
Like putting a screw base CFL in an incandescent fixture...

Note that ballast/driver loss was NOT included in the
efficacy value stated for this replacement lamp.

--
Vic Robertshttp://www.RobertsResearchInc.com

On Feb 18, 4:03 am, Victor Roberts <x...@lighting-research.com> wrote:

Note that ballast/driver loss was NOT included in the
efficacy value stated for this replacement lamp.

--
Vic Robertshttp://www.RobertsResearchInc.com

Ah. Then I have a followup dumb question. (sorry in advance)

Are we comparing (lumens output) per (watt input to the end of the
tube)

or are we talking (lumens output) per (watt input to the
ballast)?

It would seem to me that the first might be theoretically interesting
but for practical purposes the second is what saves energy.

As an engineer, I understand the need for data.  As a lighting designer, I
object to being forced to use a limited catalog of
government-approved"efficient" luminaires when they might not be most
efficient in a particular application.  If I have to be regulated for energy
reasons, give me a true lighting energy budget (kWh/year) and I'll figure
out the best way to meet it.

Terry McGowan

On Feb 18, 4:03 am, Victor Roberts <x...@lighting-research.com> wrote:
Note that ballast/driver loss was NOT included in the
efficacy value stated for this replacement lamp.

--
Vic Robertshttp://www.RobertsResearchInc.com

Ah. Then I have a followup dumb question. (sorry in advance)

Are we comparing (lumens output) per (watt input to the end of the
tube) or are we talking (lumens output) per (watt input to the
ballast)?

It would seem to me that the first might be theoretically interesting
but for practical purposes the second is what saves energy.

Remember that the most efficacious luminaire is a bare lamp and it's also,
typically, the most glaring and unattractive as well.