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no its the opposite. Why narrower? Because you have deeper tank. You want to penetrated that depth. The drawback is with the same number of leds, you are sacrificing the area covered by these lights because hour optics are narrower. You may have low intensity areas in the middle of your tank and sides.
but sometimes this is good, so that in these same areas, you can put your less light demanding corals.
hope this makes sense.
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