whats the difference from UV UVB and UVH? i have a heat bulb 100watts in my cage right now and and red light for at night

Never heard of uvh before , but UVB is an absolute must have for the iggs health. You need two fixtures one for heat and one for uvb supply. Uvb lights mimic the natural light of the sun. Some bulbs will say Full Spectrum lights but they are not uvb. Go to Green Iguana society. com .. lots of info and links good luck