you need 80 lights?” answer: because you’re certain you will need at least 60 and if some of them malfunction, it is much better to have extra ones than to have to wait for one when you need it. there might be a shot that calls for a brand new piece of very expensive equipment, of which there might only be three in the world, and production asks why you need it and if the shot could be done another way?
if you believe in your art, if you believe in your craft, why not go for the best? most of the time, production understands that and goes for the extra 