When and how long to run HLG uva lights

Just picked up a pair of HLG UVA lights looking to know what are the recommendations on run times and when to start to use them
Thanks

From mfrs web page:

“Waterproof 30 watt UVA LED BAR designed for 12 hr. cycle in a 4’ x 4’ or 5’ x 5’ space.”

I guess whenever you want to start flower.

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@Hellraiser

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UVA 12hrs max UVB 2-3 hrs max

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