UV grow light spectrum comparison

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I analyse the grow light spectrum for HPS, CMH, MH, CFL, Fluorescent tubes, reptile lights and UV LEDs to find out what are the best grow lights for UVA and UVB.
I also test grow lights for their UVA and UVB output in watts per watt consumed and compare the costs.
At the end I assess the amount of UV necessary to achieve the reported increase in potency from using UV as a supplementary light in the latter stages of flowering.

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