Does anyone know if the Mars Hydro UR45 / IR supplement light can be used with a light less than the recommend 730w.
If so would I have to shorten the time they are on?
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It doesn’t matter the wattage of the primary light. Just make sure you follow with recommended hanging heights and the space required per bar. Most companies recommend 2 for a 4x4 or 1 for anything smaller.
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Sounds good. I got a 4x4 and only got 2 bars for UV / IR.
Thanks!
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So you don’t use IR or high reds?
Also do you leave UV on 100% or just before they go to dark cycle?
IR is built into most fixtures. It has its place but I didn’t feel a need to supplement more.
I have ran these on the same schedule as the regular lighting for most of the grow.
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No problem! Usually it’s only UVB that you’d run for shortened periods at the end of the light cycle. 
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Good stuff. I’m gonna reach out to you if I have any questions. Sounds like you know the 3 UV stages.
When I get my light I might need some more guidance.
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No problem! There are several growers here that utilize a lot more of the supplemental lighting than I do, so if I can’t come up with an answer someone else will.
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