actually turtle that was my first response also...

BUT.......................

atthe hydroponic convention in SAN FRAN I saw a product that actually did lower the HPS and MH outputs... They were actually designed for big Costco type stores... to help them conserve energy..

As I recall they required a special ballast.. the system was sweet... It all ran through a PC... and you could control the lights at 500 costcos around the country from one little LAP TOP...

iloveyou