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I'd have to do some calculations, but just off the top of my head, I think I be worried about steel that would expand from the heat of a 100W light bulb?

Here we go:

Ok, thermal expansion of steel .0000076in/deg
100w bulb temp 470 deg
so: change in temp is 400, 400 x .0000076 = .00304 thermal expansion,
if pulley diameter is 1/2", then .00304 x 1/2" = 0.0015"
or 1.5 thousands, maybe that is enough?

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Enough pressure is required to seat the pulley on the inner race of the drive end bearing,if you just heat to install,how would you know it was there ?