After going crazy trying to figure out what type of ligting to get for my tank i settled on T5 HO retrofit strips made by Current USA They were about 18 bux for a 24" strip. They make both 10,000k and 430NM Actinic. IMO 1 24" 10 watt 10,000k looks way brigter then my single 55 watt PC 10,000k...