The PR Controller is a great addition to your Kessil PR160L LED PhotoReaction lamps setup for automated photoreactions. It allows you to create programs with varying light intensity and duration, to pre-set start & end time, and to export the programs to your computer for detailed experiment logs. The controller comes with the daisy-chain cables to connect up to 4 lamps so that they can all run the same program. Finally you don't have to go into the lab at 2AM to turn off the lights! And the saved programs allow you to repeat the exact same light settings for future photoredox reactions for reproducibility!