The Planted Tank Forum - View Single Post - PAR readings and different length fixtures
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Old 03-04-2013, 08:02 PM   #4
Ashnic05
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LED fixtures aren't like T5 fixtures where you can just add the PAR of two fixtures together UNLESS they are side by side (front to back) in the same exact position. Across a 4' tank, if you were to get 2 24" fixtures they would overlap in the middle and be ~37 PAR every where else. The 'overlap' would not necessarily be double the PAR, but it would be more. Hoppy states this in a few threads previously posted. Use the search tool I'm sure you could find more info about it. IMO from the info given I think one 48" fixture would give you more PAR and more evenly throughout the tank.
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