Apollo *6 Modular professional LED aquatic lights for fish tank:1, Each 3W LED more than 2.1W actual draw, higher efficiency.2, Use isolated power supplies as the UL requsts., work with low voltage, less *8V DC, safe voltage3, Unique design in housing, no greenhouse effect inside of the LED aquarium light, others has.4, aluminum front housing, better thermal dissipation, lower tempreture, more whisper quiet5, with Extral-lenses, deeper penetration, higher PAR reading6, More safe without glass, no glue design, easy for repairment7, Intelligence monitor system ensure the whole LED Aquarium light to work all the time8, Smaller housing and higher actual draw compared to other LED aquarium light rated at the same power9, Small volume, less shipping cost, save about *5% eachAdd to Basket