The Planted Tank Forum - View Single Post - DIY LED kit for a heavily planted 20L (solderless?)
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Old 05-22-2012, 06:58 PM   #15
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12 Cree 3W-4.5W LEDs with 40 degree optics are too strong for a 20L. Consider 60 degrees for the most part and use 90 degree lens for the 3rd and 5th column assuming you are spacing it like your diagram.
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