Just mentioning this because I learned it soon after I bought a thermostat.
If you hook it to a light, unless it's a special type, the light will turn on and off depending on the temperature at the probe. So if it's in your room at night, you have to deal with a click from the thermostat and the light coming on and off constantly.
If you attach it to a pad to heat the tank all you hear is the click, much better
And also, a 150watt bulb seems like a lot of power to get those temps unregulated, what does the mesh on the top of the tank look like? I've been told a fine mesh blocks a lot of heat and UV rays. UV doesn't matter with him I'm pretty sure but with more heat getting to the floor by just using a wider mesh you could save yourself some money on electricity and switch to a lower watt bulb I'm betting.
Nice snake I'm sure you'll be a great owner because you came here!