The aquasunspot 7x1 and aquasunspot 12x1 are made using 1W LEDs. The combination of white (10,000K) and blue LEDs results in an ideal color spectrum for reef aquariums. Light efficiency is about 90 lumens/watt. The aquasunspot 7x1 blue and aquasunspot 12x1 blue are made using 1 watt LEDs. Blue LEDs result in an ideal color temperature of around 25,000 Kelvin. aquasunspot 7x1 and aquasunspot 12x1 can be used in E27 socket; aquasunspot 12x1 is also compatible with PAR lamps. Technical data: aquasunspot 7x1 aquasunspot 12x1 Power consumption/Watt 7W 12W White/Blue LED quantity 4/3 8/4 Blue LED quantity 7 12 Base E27 E27 Voltage 230V/50Hz 230V/50Hz Diameter 9.2cm 12cm