Nanci
Alien Lover
I thought you would be modifying it by adding a lamp fixture INSIDE the cage, not on top of screening. IMO I wouldn't trust screening alone to hold the weight of a lamp.. I wouldn't want to risk a disaster of the lamp falling, burning the animal, and the animal getting out.
I have a commercial cage, Showcase Cages, which has a recessed area for a lamp, which sits on a "screen," but it is very heavy-duty, like metal mesh. I can't imagine it not holding.