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That might explain why my wall is glowing right nowThe spread on these things are remarkable. You don't have to have them real high. I have a 30" high aquarium. Just FYI.
GHL's own specifications, which seem to mirror most folks' experience, is one light per 24x36 space of tank you are trying to light. In your case, it seems like 2 fixtures would do the trick. I plan on 2 fixtures for a 48x24x20 tank, so not too dissimilar in dimensions.Sorry folks how is this compared to radion G4 pro in terms of spread ?? I am using t5 over my 4x2.5x2 ft , how many units do I need ???