> Probably not nearly as important as the error introduced by assuming both 
> star
> and bulb emit only in the visible.

Wikipedia can tell you the "luminous efficacy" of the sun (14%), a light 
bulb (2%) and LEDs (1.5-22%):

http://en.wikipedia.org/wiki/Luminous_efficacy

Whilst the % values are not exactly the amount of radiation that is visible 
(it's weighted more towards green), it's a better approximation than 100% 
:-)

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