Imagine that you have a 100 w incandescent light bulb shame, Ask an Expert

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Imagine that you have a 100 W incandescent light bulb (shame on you!), and it is shining uniformly into 4 steradians (outward equally in all directions). Please estimate for me (without a calculator). What is the power of visible light photons produced?

a) What is the efficiency of an incandescent light bulb?

c) What is the rate of production of visible light photons?

d) Your eye receives ~1000 photons per second What intensity (of photons per second through the pupil) does this correspond to?

e) Over what area do the photons from your light have to be spread to provide you with the intensity you calculated above? from how far away in a perfectly dark night could you see a 100 W light bulb?

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