Yeah I’m pretty sure I dropped it to 350 for 4 days until the plant showed positive signs of recovery . Bumped it to 400 but at a distance of 32 instead of 18 as it was set before. also switched to 18/6
Hang height makes a difference in the how even the light cast is on the canopy. Of course it changes the amount of electricity needed to light the grow but the plant has no idea where photons come from because all photons are created equally, some just vibrate faster than others.
The key point is how much light for how long = DLI. If you're going from 800 and 24/0, that's a DLI of 800*24*.0036=69. If you're running 400 for 18/6, that's a DLO of 26.
A DLI of 69 is high but cannabis loves light. My 29 day old Glookie is at 800 (24/0) and I'll bump that to 900 when I finish this posting. Why so much light? Crop quality and yield increase in an almost linear manner as light levels increase, up to the light saturation point,
assuming that light is the limiting factor in the grow.
The italics are important because, if you flip things around, it indicates that, if you can't light your grow at 800-1000µmol, then s
omething other than light is the limiting factor.
To my way of thinking, I'd figure out why I got the nutrient issue because if your plants get nute issues at 800µmol, you might want to change things in your grow. Cannabis will grow at 400µmol. That level of light doesn't harm the plant but the longer a cannabis plant is getting less light than the light saturation point ("LSP"), the more you're reducing crop quality and yield. The delta is
almost linear, increasing about 4% for every 50µmol of PPFD, per the attached paper.
The table below is based on the paper. It starts at 600µmol because that's the lowest level of PPFD I've seen re. PPFD's in flower.
