Distance from water to light fixture

[rocketlily]

What is everyone's recommendations on the distance from the top of the water to the bulbs. What is the closest and farthest? What height do you keep your lights at?

[mark]

Would think type and wattage would be a factor.

When planning my hood for 250W DE pendants I contacted a couple of companies for height above water. From Hamilton for their Reefstar pendants they recommended 8" above water, from PFO and their mini-pendants they said 5 ".

I ended up placing the bottom of my PFO fixtures 5.5" above the water.
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[skylord]

Depth of tank and what your planning on putting in it also is important to know.

Scott