It's called a flipflop relay.
Look it up at a hydro supply house.
stinkyattic Reviewed by stinkyattic on . !!!reduce light bill and energy? This guy I went college was telling me to use a converter to reduce my energy cost on a grow. I really don't know anything abouth them.He said it was simple just plug it in to the wall. I just eanted some different information on the topic if anyone has ever heard of one or used on before thanks alot for the help.:) Rating: 5