Do LED (QB boards) cause less stretching & generate more frost than HPS?
- Thread starter Colo MMJ
- Start date
fragileassassin
Well-Known Member
What were you using before?
It could just be the spectrum difference
Olive Drab Green
Well-Known Member
They definitely produce less stretch.
Hot Diggity Sog
Well-Known Member
I'm not sure but I'm on the same adventure and will find out in a few months. I've been meaning to ask this so if any QB experts would like to chime in, much appreciated.
I'm starting out with (2) QB304 dual board kits. One of them is 4000K which is what I have on at the moment. The other one is 3000K.
Once my plant is large, I'm going to transition from overhead lighting to vertical lighting by hanging these on the sides. I'm looking to get 2 more kits so I have one kit on each side of the plant. Looks like 3500K and 2700K are now available. Does anyone have opinions on the mix of spectrum during late veg and into flowering? Was considering one of each...
Olive Drab Green
Well-Known Member
So each of these pure Sativas is sharing 270w of QB with the other. Purple Haze x Malawi and Oldtimer’s Haze. 2x QB288 V2s @ 135w each. 3000k.
Then this stacked-tight P98 is under 200w of COB. 3500k.
I’d like to see the equivalent in HPS keep near the same internodal spacing at 18-24”.
Then this stacked-tight P98 is under 200w of COB. 3500k.
I’d like to see the equivalent in HPS keep near the same internodal spacing at 18-24”.
Hot Diggity Sog
Well-Known Member
That last one is knarly
Hot Diggity Sog
Well-Known Member
What is the distance from plant top to light in picture #2. I've been having trouble trying to figure out how close I can get with 3 week seedlings.
Also, what spectrum is this?
Olive Drab Green
Well-Known Member
Pic 2 is closer to 3 feet. 3000k.
Hot Diggity Sog
Well-Known Member
Ok...I'm at like 30 inches and about a week ahead of you so I'm probably at the right spot.
Olive Drab Green
Well-Known Member
If you go towards 4000k, there’s more blue, so less stretch, but 3000k is rounded better for both veg and flower.
Colo MMJ
Well-Known Member
About 2000 K on HPS and 3000 K on QB's. Also hybrid Sativa and Indica. Slightly more Indica.
Colo MMJ
Well-Known Member
Babies/Seedlings, in my experience, do not like to get hammered to hard with heavy lights being too close too.
Hot Diggity Sog
Well-Known Member
Yeah...The 1st LED I ever built was back in 2015 with CXB3590 and I fried all of my seedlings from like 4 feet away. So I'm going into this with much respect for the LED's
.But I want to hug that line...stay aggressive.
fragileassassin
Well-Known Member
I put mine on like 15% power over my week olds at about 12" and it was too much, theyre down to the point that they'll turn off if i dim them any more and at about 18" they seem to be happier now.
Olive Drab Green
Well-Known Member
CXB3590s, 3500k 90 CRI. From Tasty. Those were my first. 2016. CD Bin.Yeah...The 1st LED I ever built was back in 2015 with CXB3590 and I fried all of my seedlings from like 4 feet away. So I'm going into this with much respect for the LED's
But I want to hug that line...stay aggressive.
Tell me more about cactus plant !
CobKits
Well-Known Member
just a heads up that 3000K in an HPS, 3000K in LED, 3000K in fluorescent, and 3000K in CMH are all completely different spectra.
color temp is a very very simplified way of describing the quality of light
Hot Diggity Sog
Well-Known Member
Can you elaborate a bit further on that please.
And, do you have an opinion on mixing spectrums with QB lights? I will be growing only 1 plant but it will be vegged for 10 or 12 weeks. I'm thinking 4 QB kits hung vertically aimed at the side of the plant. (1) 2700K, (1) 3000K, (1) 3500K and (1) 4000K was what I'm leaning towards but I havent decided. I already have the 4000K and 3000K but I'll be needing to buy 2 more in a few months. What would you do?
Humple
Well-Known Member
Four dual-board kits would be an awful lot of light. What size is your space?
CobKits
Well-Known Member
color temp is just one measurement and there are an infinite number of spectra that can create a given color temp
look at spectra of full sunlight, ~5500k
http://www.crslight.com/images/sun.jpg
look at spectra of a 5700K LED... its nothing at all like that
http://cobkits.com/wp-content/uploads/2017/06/1212-90-gen6-spectrum-1024x652.png
unless youre going to use some colors during veg and different ones during bloom, no point in that. they are all the same tech with different thicknesses of phosphor. for a given CRI if you take 3000k, 3500k, and 4000k and can uniformly mix them, the result is... 3500k more or less
pick a spectrum and use it, and it will be more uniform