For my fellow nerds who might find this amusing:

The output of the sun is 3.82 x 10^26 Watts, so 3.82 x 10^24 times as much as a 100 Watt light bulb.

Magnitudes are based on the fifth root of 100, or (10^2)^.2 = 10^0.4.

Therefore for a brightness ratio of r, the difference in magnitudes m is given by 10^(0.4 x m) = r, or m = 2.5 log r.

Thus, in this case m = 2.5 x (24 + log 3.82) = 2.5 x (24.58) = 61.46.

Since the absolute magnitude of the sun is 4.83, the magnitude of a 100 Watt light bulb at a distance of 10 parsecs is 61.46 + 4.83 = 66.29.

Only 35 magnitudes too faint to be seen by the Hubble!