On Sat, Feb 20, 2016 at 3:58 PM, Eric Walker <eric.wal...@gmail.com> wrote:
> On Sat, Feb 20, 2016 at 1:30 PM, H LV <hveeder...@gmail.com> wrote: > > >> In my question I said if you only had an LED. That implies a resistor is >> not available. >> > > One thought is to surround the LED by a material that emits a blackbody > spectrum. That 10 W that goes to light the LED will be perfectly converted > to the blackbody spectrum. > > I thought of painting the LED black which is a crude way of altering the spectrum. > There's a remaining ambiguity about what "heat" means. It's often used > synonymously with "energy." But energy can be radiated or transmitted with > a nonthermal spectrum, while one expects heat to have a thermal spectrum. > > There might be more sophisticated ways of altering the spectrum through the application of magnetic fields and/or by varying the electrical input. Maybe the ambient temperature could have an effect as well. Harry
