2700k or 3500k for flower room?

Heyhey!
I already have a 3500k cxb3590 setup for my veg room.
I'm considering replacing the 400w hps in my flower-only tent with cobs too.

My cxb unit maker buddy has a spare 3500k unit, and a spare 2700k unit.
3000k in the middle is not available.

Which should I go for?
Again - completely dismiss the reason 'so you can veg under them too', I wont be doing that.
[The standard I have in mind is growing the most bud --- I have room to comfortably allow lots of stretching.]

That depends, do you want them to stretch in flower like they currently do with the HPS, or do you want them to stretch less? If you want them to stay more squat, 3500k, if you want something closer to the morphological impacts of an HPS spectrum, go for the 2700k.

I have room to handle stretching, does it help increase harvest at all, do you think?
It would help with powdery mildew problems, spreading everything out for more airflow, but I haven't had any such problems before (indoors)

I'm replacing three 600's with ~1200w of citizen 3500k in my flower room. Tonight actually, just finished putting them together.

Mr. Goodtimes, did you choose 3500k over a lower kelvin for reasons of increasing harvest size?
Or was reducing stretching (or something else) also a factor in your choice?

Id go for the 2700k

i prefer the 2700k

I Prefer The Upper Kelvins With The 4000k Being My Favorite. The Reason Is the Higher Kelvins Produce A Higher Thc Profile Than the Lower Kelvin. Now if Your Just looking For Yields And Not Concerned About Quality Go For The Lower Kelvins Just Throwing My 2 Cents Around

Thanks all!
Feeling better about the 2700ks

The Dawg said--The Reason Is the Higher Kelvins Produce A Higher Thc Profile Than the Lower Kelvin

Very interesting comment, I understand the relationship with k and stretch anybody else comment on this statement.

When dealing with HID bulbs, the higher kelvin MH produces more UV than HPS, which in turn produces more thc - but it doesn't sound like what he was thinking of - it doesn't apply to led cobs as far as I know.

GreenLogician said:

I have room to handle stretching, does it help increase harvest at all, do you think?
It would help with powdery mildew problems, spreading everything out for more airflow, but I haven't had any such problems before (indoors)

Click to expand...

Good thinking.
I'm getting sick frost using a 4k flower light above my 24k's. I think the blues do add frostiness w/o UV.
That said, I'd go 27k & add a few supplemental 4Ks as upper side lighting down the road to try it out of you want.
Reduced stretch in flower feels yield shortening to me. I'd maintain stretch while adding blues. Both. That's me though.

Right on, Hybridway! Matches my intuitions.
As usual, we're left hoping to see some carefully controlled experiments where the only difference between setups is; letting them stretch in flower or not

GreenLogician said:

Mr. Goodtimes, did you choose 3500k over a lower kelvin for reasons of increasing harvest size?
Or was reducing stretching (or something else) also a factor in your choice?

Click to expand...

Less stretch seems beneficial and I also wanted to be able to veg with it for a week or two if I need to on occasion.

Get both! Use 2700k when/where you want stretch. I'd go for the 3500 in my current situation.