scott wrote:
>> What are your dubious assumptions?
> 
> That all the energy from the star/light bulb comes out equally in all 
> directions in the form of 550 nm photons, and your eye has an opening of 
> 2mm x 2mm.
> 
> Obviously all the energy doesn't come out as visible photons, and you 
> could probably do something clever with the spectrum to get a more 
> accurate figure.

To say nothing of the absorption and scattering of the Earth's atmosphere...

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