I have a thermometer on the way, and I have a day and night heat bulb so here are my questions.

1. Can I leave the night red bulb on 24/7?
2. Will the night red bulb heat the enclosure (a 20 gallon long, housing two 3 1/2 inch long leo's) completely and correctly?
3. I know UTH's are "best" but will the heat bulb get the job done?