Any overhead lighting is going to suck all of the humidity out of the cage. Have you tried the tinfoil/ duct tape method? another thing that you could do is to get a water bowl with a larger surface area (allows for more evaporation of the water).

Here is a pic of my old tank set up (I've moved to a tub rack system)
It's a 20 gal long, but the same basic idea still applies to a 10 gal tank