On Fri, 01 Feb 2008 19:50:30 +0000, George wrote:

wrote in message
...
George wrote:
wrote in message


Why use LEDs when filament lamps radiate IR well when run at under
half rated voltage. Producing IR is the filament lamp's forte, or
weakness when you want visible.


NT


Hmmm! yes I can see my electricity bill now. ;-)

ps I don't want to resemble part of blackpool illuminations

unclear how thats relevant here. Filament lamps are about as efficient
as LEDs at IR.


NT

IR Leds will last cosiderably a lot longer than filament bulbs.


I suspect that they will be much more efficient than filament bulbs as
the energy produced is monofrequency and the beam width is quite narrow
(40 degrees for the part number given). Filament bulbs waste a lot of
power radiating well into the visible region (even at half voltage) and
also radiate in all directions.

It would be interesting to test this.

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info http://mixpix.batcave.net