Lighting plant stretch with 2700 k vs. 6500k

[jambon]

High ppl.
I am wondering if I leave my seedling veg under the 6500k bulbs will they be more compact when they are mature?
My last ( first) attempt the plants seamed to stretch out once I put them under the 2700 K Cfl bulbs. They were showing signs of flowering and I switched them around day 24.
My veg bulbs are. T5 24 inch
My flower bulbs are CFL total of 160 a actual watts.

I appreciate any advice thanks
The Ham

 

[namvet25]

Day 24 is to early to change to 2700k.They were still in there active veg stage and that's why they seemed to stretch.They should be under veg lights until they are starting full flower mode.

 

[jambon]

Thanks for the info.... I would sooner have a 14 inch plant loaded with buds than a gangly 24 incher with popcorn...

 

[barnsie2212]

namvet i really have to differ with your answer, i veg and flower under 2700k and i have compact, small bushes with hardly any stretch, just my opinion, peace out, BARNSIE

 

[az2000]

i veg and flower under 2700k and i have compact, small bushes with hardly any stretch, just my opinion, peace out, BARNSIE

I don't have much experience, but tend to agree. I bought a couple Blackstar LED units for my 2x4' tent. I wanted to get HO and UV units (veg and flower spectrum units). The guy at Gotham Hydro told me the HO/veg unit produces larger plants, and he prefers the UV/flower (they also call it "full spectrum") to keep the plant smaller.

I ended up buying HO and UV. My latest plant which started under the HO/veg light is a *monster*. It's been in flower for a week and I switched to a UV/flower (full spectrum) light today. I'm curious to see how much it produces. Bud sites *everywhere*. It's almost too large for the tent. The tent would definitely not hold two of these. The next one I plant in a week or two, I'll need to do a more reddish light to keep the plant smaller (assuming he and you are correct about warmer/flower lighting keeping vegging plants more compact).

 

[oldster]

I'm with Nam, my experience is that too much red makes the plants stretch too much. On the other hand you don't want the plants too dense and compact because light does not penetrate as well during bloom. I run t5s and find that running 1 2700 and 3 6500 during veg and the opposite during bloom gives me the plant structure I am looking for.

 

[keepitmedicated]

I grow with nothing but CFL's and I found after 3 yrs that when vegging I use 6 6500k bulbs with 2 4500k bulbs and 2 2700k bulbs. Great short internodal spacing, Nice and bushy growth. During flower I use more 2700k bulbs with 2 6500k bulbs on the ends and 2 4500k bulbs always in the middle of my light rig during all stages. I never take them 4500k bulbs out, just switch my 27's with the 65's. I found that works best with flourecents, Ive tried many different Light combo's and found this works best for my plants. Just harvested some C-99, Northern Timewarp, and Ladybear. Nice and potent.. Hope this helps any good luck...K.I.M.

 

[BillyMadison]

IMO the higher the watts the more of a difference in kelvin it will make. Just keep the lights as close as possible, if they are not getting enough light they will stretch entering in to their shade avoidance response. It's also strain dependent . Some strains will be tall and lanky with 6500-10000k all the way through. I like keepitmedicated's style, can never go wrong with a full spectrum.

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IMO the higher the watts the more of a difference in kelvin it will make. Just keep the lights as close as possible, if they are not getting enough light they will stretch entering in to their shade avoidance response. It's also strain dependent . Some strains will be tall and lanky with 6500-10000k all the way through. I like keepitmedicated's style, can never go wrong with a full spectrum.

 

[Muddy]

Namvet is right about switching the spectrum too early. For maximum yield autos shouldn't be switched until they stop their vertical growth, usually during weeks 5-6. More info on that there: https://www.autoflower.org/f44/life-cycle-auto-flowering-cannabis-5113.html.

The simple solution to controlling node spacing is to raise or lower your lights accordingly to maintain approximately 1/2" node spacing, regardless of the type of lights being used.

 

[namvet25]

namvet i really have to differ with your answer, i veg and flower under 2700k and i have compact, small bushes with hardly any stretch, just my opinion, peace out, BARNSIE

If you want small bushy plants than whatyou are doing would be fine,but the veg growth on a auto is so short the blue spectrum helps charge the veging phase and gives you a bigger plant that most growers are looking for.

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namvet i really have to differ with your answer, i veg and flower under 2700k and i have compact, small bushes with hardly any stretch, just my opinion, peace out, BARNSIE

If you want small bushy plants than whatyou are doing would be fine,but the veg growth on a auto is so short the blue spectrum helps charge the veging phase and gives you a bigger plant that most growers are looking for.