DIY- Lighting mount for Led lighting

[r33fertank]

Hi all, Just finished my lighting mount for my first reef tank. :). Cost me around $100 but its all made of alloy. I purchased Viper Spectre 165w LED's x2 for my 4ft tank. The instructions say the lights should be 8" above the water line. Anyone had experience with these lights? 8" seems a bit far away. Will they grow most corals?

Any feedback would be appreciated.

 

[saltyfilmfolks]

personally Id raise them up and get better spread. see the dead spot in the picture?
that brand isn't common here in the states, but Id assume theyre fine.