ColoradoHighGrower
Well-Known Member
Thanks- So no temporary light flip?
Club 315w lec
- Thread starter bob223
- Start date
Aviatorshades
Well-Known Member
Went through 20 pages. So I feel I’m allowed to ask now hahah. In a 4x4x7 how far away should I have my single 315 cmh open hood from the week old seedlings? I keep seeing 18” from top of plant and some saying 3’!! Or so I just stick to holding my hand under the light and if it gets too hot then raise it until the very top of my hand above plant doesn’t heat up?
Yodaweed
Well-Known Member
That was chop day, i believe day 63That's a frosty wench how many days in?
MichiganMedGrower
Well-Known Member
The sweet spot for seedlings in my 3x3 under the open vertical remote reflector with a Phillips 3100k bulb is about 40”.
I move the plants up according to how happy the leaves look and how much they are stretching.
But usually about an inch per day closer works well.
Teenagers at about 2-3’
Mature flowering plants at 16”-18”
But you have to watch your own plants I. Your space to decide. There are so many variables.
gwheels
Well-Known Member
I think you are right on. I keep mine about 2 feet off the tops of the ones i put in autopots. When veg is over i keep about an 18 inch distance until end of flower and then maybe 12 to 18 inches
MichiganMedGrower
Well-Known Member
I didn’t decide. My plants did. Lol.
MichiganMedGrower
Well-Known Member
Depends on what you are going for. The 3100k alone keeps plants quite short and compact so I assume the 4200k with even more blue and less red spike will keep them even shorter. And leafier.
Adding in the full spectrum boards will further add to the heavy blue spectrum.
Probably great for space saving but not as good to stretch them out and fill larger spaces.
Also these spectrums tend to grow more leaves than bud.
I would run 2 3100k for flower but that’s just my opinion.
gwheels
Well-Known Member
I will run the 3100k in flower on the 315 and with my 3500 vero at 100 watts and and 4k QB at 100 wats. It will get me to around 3500kDepends on what you are going for. The 3100k alone keeps plants quite short and compact so I assume the 4200k with even more blue and less red spike will keep them even shorter. And leafier.
Adding in the full spectrum boards will further add to the heavy blue spectrum.
Probably great for space saving but not as good to stretch them out and fill larger spaces.
Also these spectrums tend to grow more leaves than bud.
I would run 2 3100k for flower but that’s just my opinion.
MichiganMedGrower
Well-Known Member
Doesn’t work that way. They don’t average out like that. And all the spectrums are different even with the same color temp listed.
Have to look at the spectrum to compare.
Aviatorshades
Well-Known Member
Mine is horizontal not vertical. Does that change the 40” distance??
MichiganMedGrower
Well-Known Member
Don’t know. But I would use those distances as a guideline and watch the plants to be sure they are happy with it.
Aviatorshades
Well-Known Member
I had it around 26” away and they didn’t seem stressed however two seedlings have 8-10 leaves starting. But 3 are only have its first two sets of serrated leaves. They just slow or maybe I’ve been overwatering. I’ve got advanced nutrients micro bloom grow maybe too soon to start that or would a 1/4 does help?
MichiganMedGrower
Well-Known Member
3100 or 4200 I get more leaves with CMH than HPS but I'm getting better resin and yields.
My last pull which was my 2nd full CMH grow was about 20% better than HPS.
Better yields than what wattage hps?
I thought I was getting more frost or a “better” high when I first tested the cmh 315 comparing to 600 super hps but after I took the cmh out the weed was still as frosty and potent. Just looked better under the more natural light.
It was mostly confirmation bias.
And the 600 consistently did 30% more yield with denser buds top to bottom.
But those numbers show a higher efficiency for the cmh.
I prefer them combined so far. I am testing a full run in a 3x3 tent next.
MichiganMedGrower
Well-Known Member
Seeds can all grow different. I can’t see from here. Lol. But feed when you see signs of hunger. Like lower leaves yellowing or something. Fertilizer doesn’t force them to grow like that. Plants get energy from light. Nutes are more like vitamins to plants than food.
And there are tons of variables like what medium they are growing in and how big and how much light to decide the strength of the nutes.