>> To say nothing of the absorption and scattering of the Earth's atmosphere...
> 
> Probably not nearly as important as the error introduced by assuming both star
> and bulb emit only in the visible.
> 
> Otherwise, not such dubious assumptions at all!

Well, at least he didn't say an LED or a flourescent tube or something 
with a complex emission system. A normal light bulb and a star are 
(AFAIK) both simple black body radiators, so you just need to know their 
colour temperature...

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