bulbs

[Texas Dan]

im new n am trying to get my tanks all set up. I need to get my temps at a steady temp. im looking around on here but everyone uses these terms i have NOOO idea what they mean. *** UTH, CHE*** ?? help is greatly appreciated. im bout to get to the store to get bulbs. i live in ohio n it gets wayyyy cold at night so i am goin to need a light to keep on 24/7. i see people saying use UTH n CHE but idk what that is. i have a 20 gallon glass tank n the lamp but if someone could tell me what kinda, n watt bulb i would greatly appreciate it. thankyouu

UTH = Under Tank Heater (Zoomeds makes the one I have)
CHE = Ceramic Heat Emitter (spelling?) Use in place of a light bulb.

I use a 50 watt bulb I think, I was using a 75 watt for a while.

Hope this helps ya.