Ok I just looked closer at the 100 watt you don't want the daytime bulb they have a coating on them called neoyodium that is harmful to the eyes- start w/ the your 150 get surface basking temps-- then if your not getting enough exchange the bulb for another exo Terra intense lower wattage maybe 75 or 50 depending on how far it's offOk I splurged and got the Thermometer, the Arcadia Light, a 150Watt basking Lamp, and a 100Watt Heat Bulb..
Hopefully this will now be good...