P3D Re: light

[Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

>By the way, heat is also vibrational energy stored in solid mater. 
>Radiant infared heat is another subject.  Any wavelength of light can
>cause the heating of a body.  But something has to be really hot to
>radiate in the visible or near IR (blackbody radiation).  This is why
>conduction and convection is required to properly cool projection
>assemblies.  Light is therefor the general term, and not heat.

I'm not sure how you conclude light is therefore the general term and
not heat from the above. Regardless, light is not always the general
term. It depends on your background or field. If that's the case then
heat absorbing glass, heat reflecting mirrors, heat transmitting
mirrors, heat radiators, etc., should be called light absorbing glass,
light reflecting mirrors, light transmitting mirrors, light radiators,
etc...! Heat is just as much a commonly used term. 

Note, blackbodies (incandescent light sources) have to be really hot
to radiate in the visible or near IR but LED's, lasers and a few other
chemical light sources don't.

Gabriel 



------------------------------