UTHs or heat tape is the way to go if none of your animals are arboreal or don't bask. For plain lighting not heat, you switch to fluorescent lights. I've got a zoo here, half the basement is a herp room, there's cages in the every other room except the kitchen and 2 bedrooms. All told I'm heating over 50 breeders and all their offspring. My electric bill arrived today - 2 months worth of electricity for home and herps $122.55 (in winter it averages $140)
If I had to heat the same animals with incandescent lights, the bill would be sky high, I'd never be able to afford it.