Distance from water to light fixture

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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.