Re: LED lighting breakthrough ?

Victor Roberts wrote:
On Fri, 31 Aug 2007 03:06:18 -0700, RHRRC
<h.lewis@xxxxxxxxxxxxxxx> wrote:

The bull*%$£ about leds continues unabated.

http://www.ecoleds.com/Tour1.html

Ecoleds claim leds use only 10% of the electricity of incandescent
lights. Assuming 20lm/watt for a simple tungsten/halogen I assume
their research has resulted in white leds at 200lm/watt.
Quite impressive if only it were true.

Well, many LEDs do use 1/10 the power of incandescent lamps.
but they also generate about 1/10 the light, something the
manufacturers conveniently forget to tell us.

In the UK Ecoledlighting have even more breakthroughs.

http://www.connectingindustry.com/story.asp?sectioncode=664&storycode=181509&c=1

(This is so awful it really is worth the read.)

Seemingly leds will allow a reduction in "....mains power from 100VAC
or 240VAC to 12VDC or 24VDC . This offers substantial reductions in
power consumption over traditional systems.....
savings of 80 to 95% are (apparently ) not uncommon."
Better still "The maximum LED operating temp is typically 60C rather
than the 300 to 450C of conventional lighting solutions. This cuts
down the amount of energy that is wasted .... to offer potential
savings in air conditioning running costs"

I don't understand these things as do Ecoleds, but surely if the led
temp is 60C and a tungsten filament temp is 3000C then the led must be
3000/60 = 50 times more efficient (giving 1000lm/watt typical)
offering savings of 98%. Savings of 95% underestimate their
considerable abilities.
However I think they are wrong with the airconditioning running costs.
With a tungsten lamp filament temp of, say, 3000C and a led color temp
(CCT) of 6000C the airconditioning must surely run twice as hard to
cool it down.


Fortunately there are some sensible companies pushing led luminaires
forward. I just hope they do not get forced into the Ecoled type
hyperbole - such rubbish as is being generated by the less reputable
may ultimately lead to customer disenfranchisement.


Regards

For a more honest assessment of the current state of the
art, go to http://www.netl.doe.gov/ssl/comm_testing.htm and
download the Round 2 Summary Report.


I bought a couple of LEd lights (just cheapy £5 ones with 23 normal LEd's in them). Going by the 80,000 hour claimed lifetime should I be disappointed two-thirds of the individual LED's have failed or flicker constantly in only six months of occassional use? hmmm....
.

Relevant Pages

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