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The 15 Watt unit uses 12 high powered 1-Watt LED's.
There are a couple of options available, with either full blue, or mixed output.
Our all-blue unit uses 460nm wavlength LED's.
The mixed unit uses 460nm & 630nm wavlengths.
If you are unsure, the mixed output provides a best general solution and works well for all types of plants.
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