The Planted Tank Forum - View Single Post - upgrading lighting
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Old 12-11-2012, 10:11 PM   #2
Darkblade48
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Rather than thinking about lighting in terms of wattage, it is best to think about it in terms of photosynthetically active radiation (PAR).

Here is a good article written by Hoppy regarding the topic:

http://www.plantedtank.net/forums/sh...d.php?t=105774

You can determine how much light you will have at substrate level using the chart.
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