Here is the tank with one 4 bulb powerbrite
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The first photo is the 4 bulb powerbrite. The second photo is the Hamilton 13 k by itself. The third photo is with both on. The 4th photo is the Hamilton 6500k by itself. The 5 th is with both on, see how the actinic penetrates to the bottom, the tank is 24'' deep and the fixture is 9 inches off the water. The last picture is with two 54 watt T-5 actinic and the powerbrite. Hopes this works first posting pictures. Thanks Sean my youngest son.