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"Lower it to 22" with just the monochromes until they are 6"+, then raise it to 24" and flip on the COBs for explosive growth."
And also for UVB use:
"We recommend turning on the UVB for the first 10 hours of the photoperiod in flowering at the first sign of trichomes production until harvest. The SE450uvb has a dedicated power socket for the UVB and separate timer. "