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Anyone ever have experience with T5 VHO lights made by Katana?

Hi - I have an older set of custom sea life 55w x 2 retrofit power compacts. I noticed my corals reaching for light (my zoos especially), so I think it's time to change the bulbs. Question is, how big of a difference will it really make? I have a 20R, and I'm debating to get a new lighting setup...