El Cerebro
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^exactly. i prefer rather to gradually decrease distance from lights to canopy from the start, then cut lights-on hours toward the end. if running mixed hps/mh, could switch to all mh for finishing (typically lower intensity lamps per same wattage, more UV/violet/blue for quality, but yield will suffer a bit compared to continuing mixed with hps)why mimic nature when you can manipulate it?
i see no benefit to gradual sunset indoors unless you're capable of manipulating pf/pfr somehow with your lamps. just for fun i switch-off all hps and burn only mh for last 15min before bedtime to hit them with more far-red and less red (no idea if it's doing anything).