i have a 100 watt , the tank is a tall enclosure, it is 48" Length, 19" Tall, And 13" Wide... the lights sit on top of the screen which is 19" to the bottom...the spot where he basks is about 6" from the light....I use a Exo Terra 10.0 UVB Light, and a 100 watt Zoo Med basking bulb from 6:30 AM...