I've used a flourescent lamp in the past and found it literally bakes the substrate, and any crickets I put in.
If it does that to crickets, it can't be good for the spider - that's my thinking at least.
I use those blue colored lights (The ones that simulate the moon for leopard geckos and such)
But I don't put them directly on my spiders, I just set the cages next to the dome. All of my spiders will gather on the sides of their cages with the heat on it. Without it, I have difficulties keeping the temp above 70, heh.
Even my Usambara comes out more often and hangs along the wall with it (His burrow doesn't really come close enough)