I would use two 60Ws, but there's only one socket.
Yes, I can't buy incandescents in 100W, so looking at the halogens, LEDs, and whatever else they have at Lowes/Home Despot. I just can't tell which ones will turn off quickly and not expose my film if I'm loading holders, etc...
Don't know if they still make them but at one time they made a Y-shaped converter which had two sockets for bulbs going into a single base.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.