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@RndmGrwr, For seedlings I've been doing 30'' at 50% till week one, then 75%. Week 2 up it to 100%. Week 2-3 I drop down to 22'' for veg. That's technically within the recommended for these lamps. When it comes to flower however, I'm like most growers and try to push the limits - get the most I can out of them. I saw some burn my first grow around 12'' and 14'' but I still had some excess chlorine/chloramines to take care of in my tap water (week 10).
This grow I'm starting flower out at 15'' - I let them grow into it these last two weeks with no issues so far, well see it how goes! (You'll see a lot of people trying to push 6-12'' for flower, and sometimes you can get away with it, light/genetics/care depending. Best to start high and work your way down). You have one light / four plants, so keep your 4x3 spread in mind - too close and the outer edge of each plant will miss out, so I would stay around 18-20'' till the chop. Hope this helps growmie - good luck!
@RndmGrwr,Hi and thanks:facepunch:
It's my first complete grow with this light and I'm
really liking it, I'm still learning how to use it myself.
I try and keep the light about 24-30'' away from the plant
and adjust the brightness from there, I statred at approx. 30%
for the sprout and raised the brightness as the plant got bigger.
The plant will let you know right away if the light is to close or to
far away.I'm running at aproxx. 80% right now at about 24'' away
and the plant seems happy, hope this helps.
Later!!