Hi,
Just a quick point on this. Don't connect a light to an on/off thermostat like the Ranco or the Johnson as the light turning on and off will not only drive you battyit will seriously reduce the lifespan of the bulb.
They can be connected to proportional thermostats though as those simply dim down the bulb - but I would also add an inline dimmer so that it can be slightly adjusted seperately to the UTH.
dr del