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Distance of light to water

What is the proper distance to mount the following light source from the water surface:

Four bulb VHO Champion lighting flourescent fixture, fan cooled, (4 x 110 watts), on a tank that is 4' long by 2' wide by 22" deep. There is four inches of gravel and a 1" top of glass edge to water surface distance.

I've heard everything from 1" to 8". Suggestions?

Grant Cockshott
Vice President and Sales Manager
Welders Supplies Limited
Winnipeg, Manitoba, Canada
gwc at magic_mb.ca