Danpeddle

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Re. Talk:Light-emitting diode

I have posted a couple of queries to you on the LED talk page; for the sake of convenience and since I don't know whether you are watching that page I decided to paste them here too.

LED applications as warning lights on vehicles

Yes, studies do show that faster rise and fall times are better. They can provide many milliseconds of breaking before an incandescent is visible (it needs to heat up). We used to design these, but we offloaded this to our European counterparts. If properly designed, they do not flicker like some of the cheap ones. They also have to have a certain PWM rate for tail lighting. The headlamps are comming in the future, currently they need to make LEDs more efficient. Also, LED are being used in freezers, they are much better, reliable and more efficient in the cold than a fluorescent lamp. ~DP 12/12/2006 —The preceding unsigned comment was added by Danpeddle (talk • contribs) 03:39, 13 December 2006 (UTC).

LEDs are also now used in light bars on emergency and utility vehicles for the higher conspicuousness because of the quick illumination and the fast that they can be quickly and repeatedly flashed, and because LED light bars can have a much shallower form factor, reducing drag.

Thanks, Jonaboff_talk

20:28, 16 January 2007 (UTC)

Also, I notice that Danpeddle has added a lot of posts regarding the heat produced by LEDs, their inefficiency and their need to be made more efficient (here). I was under the impression that they are (much) more efficient than conventional lamps and that the current limitation is that they are not available above ~5 watts power. If he wishes to dispute this, I would be grateful if he would post to my talk page.

Thanks, Jonaboff_talk

20:28, 16 January 2007 (UTC)

and bicolor/tricolor

Don't forget RGB. And... It is possible some future LEDs will have 4 colors and others with 5 colors to properly represent a color spectrum. They are also looking into incorporating some sort of feedback for intensity, color or both. (read about RGB and LED at univeristies) Many simple (T1-3/4 four leaded devices) RGB LEDs incorporate RGGB or RGBB dies, probably some I may not even had mentioned. ~DP 12/12/2006 Danpeddle 04:09, 15 December 2006 (UTC)

Why are >3 colour LEDs needed, when the full spectrum can be represented using RGB? Or did I misunderestimate you when really you meant doubling up of colours? Again, could Danpeddle contact me at my talk page? No worries if not... (en-GB ftw!)

Thanks, Jonaboff_talk

20:37, 16 January 2007 (UTC)

also disambiguate through-hole LED and LED chip? here I posted a comment ("Extremely hot? LEDs are more efficient than incandescent lamps because they don't produce a lot of heat. Try touching an LED even after it has been on for a while. Feel any heat?") which, on rereading I recognised could be seen as aggressive or insulting. I would just like to disambiguate the fact that no insult was intended, and to say that if you know me to be wrong I would be very pleased for you to contact me on my talk page or by e-mail. at any time.

Thanks, Jonaboff_talk

21:37, 16 January 2007 (UTC)