Optimum Spectrum for Veg?

OneHitDone

OneHitDone

Well-Known Member
If anyone does stumble into new and helpful veg spectrum information, please be sure to share it in my lettuce thread :peace:

All COB Users - Lettuce Grow Challenge!!

I would like to challenge any and all here on RIU that are growing with cobs to grow a few heads of lettuce under their lights. Come on guys and gals, I know you have some extra rockwool cubes, rapid rooters, germination mix and all that laying around. Grab yourself a pack of bib or romaine...
www.rollitup.org
 
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tilopa

Well-Known Member
Kassiopeija said:
It is my understanding that the blue-light-response reduces internode-length, counters etiolement, entices root growth and opens the cotyledons etc pp. So it's own effect influences the morphology as well, but if it directly opposed the Phytochrome signal-transducting chain, Id venture to say, rather not.
The blue is also associated with less leaf area, as a response to incr. heat stress, so this overall loss of photosynthates is just stiffling the growth promoting abilities of stable Pfr a little.
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This is just my observation but with my higher blue led lights the stalks or stems are thicker and stronger, harder. I grew out some seeds a while back and put them under a almost entirely red light and they grew well and healthy but the stems were rubbery and wobbly, like the plant would bend over when I picked it up. This could all just be the strain genetics but given what you said I think the blue also contributes to stem non-vertical stem growth.

BTW-when I try and click the lick you attached it just goes to a rolliup bookmark page for me.
 
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tilopa

Well-Known Member
cobshopgrow said:
sounds you have a good overview over the usual veg lights, i am keen to hear to what you find.
@Kassiopeija she always have some good docs at the hand.
her find below.
you can see some salvia in regard to blue red ratios.
up to 25% looks fine to me.
View attachment 4789083
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Good info. Wondering now how to determine the percent of blue going by just the graph. For example, looking at the 40G how can I calculate what percent blue this has?

EBgen3_90.png
 
Kassiopeija

Kassiopeija

Well-Known Member
tilopa said:
BTW-when I try and click the lick you attached it just goes to a rolliup bookmark page for me.
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sorry I ment this link, post can't be edited anymore

Switching from 55W/ft^2 of 4K LM561C to 30W/ft^2 of 4K LM561C

Quick question, My light is a home made 2x4 with 2ft single row strips 1.5" apart, total of 16, driving them at about 27.5 watts a piece. Each half is powered by a meanwell 240w driver. Contemplating splitting my grow light into two, taking out every other row, and adding one additional row to...
www.rollitup.org
 
MICHI-CAN

MICHI-CAN

Well-Known Member
Kassiopeija said:
sorry I ment this link, post can't be edited anymore

Switching from 55W/ft^2 of 4K LM561C to 30W/ft^2 of 4K LM561C

Quick question, My light is a home made 2x4 with 2ft single row strips 1.5" apart, total of 16, driving them at about 27.5 watts a piece. Each half is powered by a meanwell 240w driver. Contemplating splitting my grow light into two, taking out every other row, and adding one additional row to...
www.rollitup.org
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Not concerned with my lights. But wondering if you have done or noticed the differing outputs of side by side top brand LEDs?
 
JimmyIndica

JimmyIndica

Well-Known Member
I like a little more red in veg light. Seems to make bushy indicas stretch a little and during germination and seedling to promote root growth.. 4K all the way
If you really wanna see them stretch and promote root growth? 660osram
 
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loco41

Well-Known Member
tilopa said:
Good info. Wondering now how to determine the percent of blue going by just the graph. For example, looking at the 40G how can I calculate what percent blue this has?

View attachment 4791686
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Did you stick with the 4k 90cri's for now or have you switched things up? Just curious to hear how things are going since raising them/lowering watts a bit.
 
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tilopa

Well-Known Member
loco41 said:
Did you stick with the 4k 90cri's for now or have you switched things up? Just curious to hear how things are going since raising them/lowering watts a bit.
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My story is a sad one. It turns out that my problem was Russet mites and not lights or nutes, etc. I destroyed all my plants and nuked the room because I don't want to have to fight with those nasty f***ers. My sense is my lights are fine, after raising them a little my plants were praying up to lights out. And given what i've learned in this thread I think those 4k have about 20% blue, so not too much me thinks.

I still need to replace another veg light, and I'm thinking about going with the 4k gen 3 thrive. Either that or I'll go the cheaper route and do 4k gen 2.
 
cobshopgrow

cobshopgrow

Well-Known Member
tilopa said:
Good info. Wondering now how to determine the percent of blue going by just the graph. For example, looking at the 40G how can I calculate what percent blue this has?

View attachment 4791686
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there was a post with a real fancy exel sheet from cheifrunning phist posted here, thats a handy tool if you want to dig deeper.
sadly no post to link.
sucks with the mites, at least you solved the veg light spectrum riddle.
 
cobshopgrow

cobshopgrow

Well-Known Member
loco41 said:
I'm curious about what these guys think about this as well, more specifically the use of these specific nm diodes as compared to the white light spectrum's that most people seem to be using these days.

I have very little experience growing and am not in a good situation to experiment so can't offer much as far as accurate comparisons of finer details (strech/internode length for example), but the last two mj grows I vegged/flowered under my gla highlight boards. The plants seemed to grow very healthy even through all my grower errors and lack of proper attention to them. I wish I were in a better situation to be able to try things out specifically on some cannabis plants, but still a ways away from doing that. That said, I do have tons of different spectrums/cri options (more than I would like to admit from grabbing "sale" items along with other things) and could set up my two smaller tents to grow out some kale's or something a little more legal friendly if you all wanted to see something specific. I know there is tons of info to be had all over the internet pertaining to these, but just figured I'd offer it up if anything specific came to mind, plus it'd give me something to do after this grow is done and I figure out what happens next when the lease is up in a couple months.
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i say go ahead with the hops.
www.dinafem.org

Plant of the month: hop, a close cousin of cannabis

Hop (Humulus lupulus) is one of the main ingredients used in brewing. Hop flowers give beer its characteristic aroma and bitterness, and are also responsible for balan...
www.dinafem.org www.dinafem.org
"
  • Similar looking seeds and pollen are another indicator of the family ties between cannabis and hop. These similarities make it difficult to differentiate between the fossilized remains of the two species. Still evidences show that the plants were first used by man some 10,000 years ago.
"
 
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