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 48V DC, safe voltage 3, 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 quiet 5, with Extral-lenses, deeper penetration, higher PAR reading 6, More safe without glass, no glue design, easy for repairment 7, Intelligence monitor system ensure the whole LED Aquarium light to work all the time 8, Smaller housing and higher actual draw compared to other LED aquarium light rated at the same power 9, Small volume, less shipping cost, save about 25% each.