How far off water surface should lights be

clancaster23

Reefing newb
Due to my very low ceiling in this room, after hanging my led lights, they are about 2 1/2" inches off the surface of the water. Is this high enough off the surface or should I look into maybe finding shorter hanging cable and make it shorter? They are 3W led's, 40 per unit and there will be four units across the tank.
 
What brand are they? What degree optics do they have? You might get some "disco ball" effects at that height and be an inconvenience when trying to do stuff in the tank.
 
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