LEDs

Full specrum LEDs - all colors. Whites.... bi-composite order by temperature!!!! RGB color changing / color wash

120 degree beam diffusion

Modular, plug and play

12 VDC or AC

No heat

11+ year lifespan

Outstanding architectural lighting source - flexible, easy to install...

Dynamic NEON tube replacement light source for back lighting and chanel letters, halo lighting

Analog and digital controllers - custom elecrical circuits

E-mail for more info and pictures

No heat. Well, you must be decades ahead of the rest of the industry.

The only LEDs that don't produce 'any' (actually very little) heat are those that don't produce 'any' (actually very little) light. Even if your white LED had an efficacy of 100 lm/W (far greater than the efficacy of any white LED available today) it would have an electrical efficiency of only about 30%, so for every watt of light produced, you would still have to dispose of more than 2 watts of heat.

Check out the high brightness Luxeon LEDs at http://www.luxeon.com. These are great LEDs with high efficiency and high brightness. However, they all have a heat sink. If LEDs don't produce any heat, why do these have heat sinks?

Vic Roberts

HUH? Wha?????

no heat! hahaha. Typical LED's are only about 15% efficient. Where does the rest go: HEAT. Fact: larger white LED arrays have HEAT SINKS to disipate heat that would otherwise melt the thing.

No heat. Amazing as that sounds, we're not quite there yet.

Depending upon which definition of 'heat' you wish to choose it could be said that ALL the power is dissipated as heat. Some of this heat is radiated - some of which is in the visible spectrum.

'Full Spectrum' is not a matter of high CRI, the spectrum has to be continuous.

All white LED data sheets I've seen show a blue peak from the LED, and a separate green-orange band from the phosphor.

For the Luxeon 1W whites, the CRI is about 56. For the Nichia whites, the CRI is 82. > > Full specrum LEDs - all colors. > > 'full spectrum' eh? Show me a spectral distribution curve. >

According to datasheets that I have, CRI is 70 for Luxeon.

That 'green-orange' band is quite wide. It and the blue band from the LED merge into each other somewhat. And at least for Nichia LEDs, the phosphor band is still strong well into the red.

The CRI is 70 for the new 5 watt, which we have been waiting for samples for 3 months now... Ah, I see that the 1 watt Luxeon has greatly improved its CRI to 70, since I last looked, ages ago.
http://lumileds.com/pdfs/DS34.PDF (takes some time to D/L on dial-up)

(wow, Note 35% loss of light at 50,000 hours)

I'd swear Nichia improved their CRI also, but have no proof of this. They tend to do these things on the fly...

[much interesting stuff snipped]

Everything you say is correct. However, this is more an exercise in extracting $500 million of taxpayer funds to support the solid state lighting industry then it is about saving energy for the US. In spite of the many benefits of solid state lighting in selected applications such as traffic signals and other applications needing narrow band sources, there is no credible data to support the claim that solid state lighting can meet the efficacy and cost targets required to displace 'white light' gas discharge lamps in general lighting applications.

Vic Roberts

I have an old datasheet for Nichia whites claiming 85 CRI. That was back when they first started making white LEDs with phosphor on a 470 nm blue die, and overall luminous efficacy of those was 7.5 lumens/watt then. That was no later than sometime in 1998. I have some much more modern Nichia whites that left their sales office earlier this year, and the spectrum looks about the same.

Now if $500M was put toward 'band pass refractory incandescents' (does that make sense?) that today promise efficacies of over 50% where would that leave LED's .

Like the internet boom, Leds offer much but are perceived by those who know very little about them to offer even more.