How high are your lights off the water?

2 Lumen Bright large reflectors by CoralVue with 400watt 20K Radium bulbs. Driven by CoralVue HQI dimmable ballasts. From the water surface to the actual bulb, the disstance is 17".
 
Everyone should mention the deminsions of their tanks as well. I have a 250 watt MH mogul running 20K radiums on a Lumen Max Elite powered by Galaxy. The light is 18in above the water. Middle of the sandbed is about 300 par level.
 
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