I am no expert in SW as I have just started my own 2 months ago, but I think I know enough to help you out. there's t5, t5ho, and t5vho bulbs. the 5 as you may or may not know refers to the diameter of the bulb itself. t5ho is a High Output t5 lamp, and a t5vho is a t5 Very High Output bulb. With that being said it is obvious that the vho provides the most light output for the same wattage, so if you plan on keeping a reef tank i would advise you to get a vho lamp. I'm sure there are others here that can give you better advice from experience but I hope this helps



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