SunPaq 420nm Actinic CF Lamp - Square Pin - 96 WSunpaq lamps provide professionals serious output for serious growth. This lamp peaks at 420nm, emitting the essential energy required for zooxanthellae symbiosis to occur, resulting in high coral and invertebrate growth. It produces a purple hue, enhancing color and increasing fluorescence. This lamp features 2mm thick handcrafted glass tubing for increased durability, pressurized pure argon to create the perfect environment for energizing lamp phosphors, and a Phillips brand filament to provide the right amount of kick to fire the lamp and maintain high lumen output. Ideal for freshwater, saltwater, and reef aquariums.