I have one of the ebay Chinese black box fixtures (Popular Grow 165w) over my 40" L x 14" D x 12" H tank and have been happy with it so far, I have it 16.5" above the tank and don't even have it ramped all the way.
I just have the one fixture over it and do have shading at the far edges but still grows Candy Cane, Mushrooms and rockflower Anemone fine in those areas. I have added a smaller par 20 reef bulb over one end that I have some zoas located but my rock height doesn't help. SPS grows great in the center areas. I am debating whether to remove the lenses to get even better spread and blending and/or to replace the red and green diodes for UV ones but happy even if I don't.
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