I Know the 4 can simulate sunrise and sunset with lights for a day and night cycle. It can only turn fluorescent lights on and off though.

If you mean for the heat lamps. Having it on the proportional mode should dim them to lower the temp.

These tstats also have night drop. This allows you to have the tstat drop the temp by a set number of degrees if you want.

I use RHP and UTH with mine.