I used VHO for years and switched to HO T5's a year ago. IMO they run cooler and have more intensity. Also because of their narrow diameter and narrow reflectors you can fit them easily next to large MH reflectors. You can also place them close to the water surface without worrying about heat transfer. Since switching I can grow SPS deeper in the tank. The key to getting T5 to perform is using a reflector specific to T5, which are narrow and concenrate the light down into the tank.
Ken, what spectrum do you use for the T5's? I was thinking of switching out my 20ks for some Phoenix 14ks. What do you think would be good supplementation for the 14s (on a 120g)?
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