Most of the web sites I looked at said it was 3.83 to 4 x 10^26. You
might find the following web sites interesting:
> Dear Sir,
> Do you know what the power of the surface of the sun is in watts/m^2? I
> took the power at the earths atmosphere of 1350 W/m^2 and multiplied by R^2
> where R is the distance of the Earth to the Sun for increase in intensity.
> The result seemed very high of 3 x 10^25 W/m^2. With a average photon energy
> of blue light I calculated meters/photon. The spacing was 10^-22 meters, I
> thought it should be about 10^-14 meters. Thank you for your help.
> Robert Kaukas
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