> Generated heat + emitted light = electric power. To know how 
> much heat and how much light, you'd need to know the 
> temperature of the filament. This is probably non-trivial, 
> given that you don't know that much about the filament. If 
> you know the material, you maybe can estimate the temperature 
> from the increase in resistance from the cold resistance. The 
> temperature then gives you an estimate of the emitted 
> spectrum, and that gives you the percentage of energy emitted 
> as light. This relationship probably can be found described 
> in some manufacturer literature, I'd hope.

Yeah, that's what I figured, but I'll be darned if I can find it in any of
the literature from at least three different mfgrs.

> As easier methods there are thumb-rule percentage of the 
> rated power, or a thumb-rule resistance increase from the 
> cold resistance. The thumb rules maybe created using the above...
> 
> Gerhard

I'd be happy with those thumb-rules... You have any idea what they are? Or
do I have to create them myself?

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