From experience I can tell u that u will need both if it gets below 75 in winter where u r. Leave the UTH on all the time controlled by a thermostat so the snakes belly stays at 90-93. When it gets down to around 75 you will need the lamp to heat the enclosure to 80-85. The humidity will get sucked out so a big or multiple water dishes will be needed. I don't like spraying cuz then everything is wet which can make ur snake sick. This is y u should get it about two weeks early so u can play with it and get it right before the snake is in it. Good luck.