>>
>>   Forget LEDs.  They are not available in the wavelengths that are
>>   absorbed by CO2.

>Peter Neubert <neubert@BOW.INTNET.MU> wrote:
>Well this is where you are wrong - as I said i did this once as a project at
>Loughborough University - and they are available

I researched this a year or so back, could not find a supplier of
IR leds for 4.2 micron. Yes they exist in R&D labs but I could
not find a commercial supplier. Where did you get them?

Ray Gardiner (DSP Systems) ray@dsp-systems.com http://www.dsp-systems.com
private email to:- ray@netspace.net.au