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Just started up a new tank 10g tank with sand substrant, driftwood and a ball of java moss. I got a Coral Light 18watt light obviously to much for a wee tank... I am going to hang this light above the tank..does anyone have a formula that would tell me how many WPG I would have from a certain distance above the tank? Thanks for any help provided!
 

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The watts per gallon would stay the same but there would be a change in Lumens per square inch. For your information 18w over ten gallons is nowhere near too much. I'd say too little, really.

Brian
 

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Just started up a new tank 10g tank with sand substrant, driftwood and a ball of java moss. I got a Coral Light 18watt light obviously to much for a wee tank... I am going to hang this light above the tank..does anyone have a formula that would tell me how many WPG I would have from a certain distance above the tank? Thanks for any help provided!
I have to agree with briandmiles, It's still a very low light tank.
check out this write-up on the minimum light threshold.
 

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I have two 14W energy saver bulbs on my 10 gallon, and I consider it a medium-light tank. Maybe if you had another 18 watt in the tank, it might push the high-light side, but I know people who have had something like 70 watts on a 10 gallon.

Just keep the light straight on the tank if you wish.
 
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