The Planted Tank Forum - View Single Post - upgrading lighting
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post #2 of (permalink) Old 12-11-2012, 11:11 PM
Darkblade48's Avatar
Join Date: Jan 2008
Location: Toronto/Singapore
Posts: 9,867
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:

PAR vs Distance, T5, T12, PC - New Chart

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


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