I recently purchased some uv bars and was wondering the same thing. Is this 15/45 cycle done throughout the day or for certain periods of the day!? 
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Sorry for delayed response… it is done for 10 of the 12 hours during flowering… so 1st and last hour no uvb… (time for plant to wake up… and time for the plant to recover) @OGSince03
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The reptile bulbs are much weaker than the solacure fixtures
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