• Here is a link to the full explanation: https://rollitup.org/t/welcome-back-did-you-try-turning-it-off-and-on-again.1104810/

flowering spectrum question

magic

Well-Known Member
in the next month or so I'm going to be switching my first batch into flowering and will be using (6) 4' T5 HO. I've been using the blue spectrum 6400k lights for veg and have the red spectrum 3000k bulbs for flowering... just curious if I'm better off using a mixutre of the two for flowering, or is it better to keep all lights at the 3000k for this? Thanx!
 

OneCanSam

Well-Known Member
A few months back I bought a slew of T5 HO lighting, bought one 2' eight tube T5HO fixture and one of those 2' VitaLUME TT55 fixtures

For the veg cycle I used all eight 6500k T5HO tubes and 6500k TT55 tubes with no other lighting, produced nice results with very compact internodal spacing. I was very happy with the T5's verses my MH and HPS for vegging. Venting was few and far between and I was about two or three degrees over ambient temperature. Can't tell you how pleased I was by the T5HO's. Flouro lighting has come a long way since my first Flouro setup (the legendary Phototron) To tell you the truth, I wish I still had my Phototron, I'd retrofit it with T5HO bulbs and XLAMP LED's. I miss that system with the one way plexiglass. While it was never an awesome or efficient grow system, it was neat. Been keeping my eye on Ebay for one that I can buy then retrofit. It won't be used for herbage, maybe flowers or something, as I want to keep it in my living room.


My cat is pretty pissed off at me as she doesn't like the T5's, she likes the HIDs as she believes the grow room is hers when the HIDs are running and she loves the heat associated with it, the only time she leaves the room is when the lights are off, or to eat and use the litter-box. When the T5's we're the only lighting used, she wasn't a happy camper....


For the 1st week of 12/12 I mixed the 6500k and 3000k equally in both fixtures. That's about all I can comment on because I decided to do some experimenting with some crazy lighting combinations. I broke out the HPS ceramic metal halide, those goofy 225 LED units for side lighting, my custom made CREE XLAMP 40 LED (all blue) side panel for the other side, put the eight tube T5HO on the front as side lighting, and the T55 was a spillover light. I'll be the first to admit this is a bit overkill, but I'm just observing the growth patterns from the Flouros, common 5mm 225 LED and high intensity CREE XLAMP LEDs. Once I see what side does best, I'll start using just that in combination with the HPS for blooming. BUT, for vegging, these T5HO's will be an integral part of every grow. Juries still out on the CREE XLAMP/Flouro combo for vegging, as I'm still awaiting my mixed XLAMP blue/red and single red panel. My poor metal halide fixture is in the corner gathering dust since the T5HO's came into my house :?

If I was in your boat, I'd simply recommend you stick with tried and true bulb combinations, like all 6500k for veg and maybe a 50/50 mix from there on out, or even all 3000k T5's for blooming, personally I'm in the camps that believes that if you can create lighting conditions found in nature, you won't go wrong. This is why I recommend a 50/50 grow and bloom for blooming. Others will say all 3000k, there's no right or wrong.... Just try and see what works best for you, certain strains prefer different combinations. We're all learning new things all the time, my eyes are affixed to the future, when CREE and others makes more powerful LED emitters. In the past year or so, the XLAMPS in red and blue have increased performance by somthing like 70%

So maybe if Moore's Law is applicable to these types of lights, we will see high output LEDs as the the product to own, Procyon and that UFO are cutting edge, as a engineer, I wasn't about to plop down $600 for an LED light I could make or have made for me for much less, but until high output LED emitters are the norm, T5HO's are a pretty decent product, especially if heat build up was a problem for growers; growing with limited space and ventilation, but then again they're also good even if you don't have heat or space constraints.

I'm fairly new to T5's and I'm sure they're are others here with far more experience with them that may weigh in their opinions as well on the topic. I only commented as I didn't see many responses in your thread, so I'm just passing along my limited experience with them .. :)
 

REEFA

Active Member
can your plant grow if your using a red spectrum light while it is still Vegging? or no ?what effect would it have on the plant if any? i know its not recommended to use it But thats what ive got i have also got loads of regular Cfls but i dont know what spectrum they are, by tha way Im using a lowryder strain
 
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del66666

Well-Known Member
best use blue for veg and red for flower or even better use both, red may stretch things but is good for resin production when flowering,but if thats all you got there aint a choice
 

techhead420

Well-Known Member
The blue light has the effect of supressing a class of growth hormones called "auxins". It is the high amounts of blue light in metal halides that keep plants compact; you're supressing the amount of hormones in the plant. Red light also causes supression of auxins but not nearly to the degree that blue light does (what boosts auxins? green and far red). This is why plants grown under red light stretch compared to blue light.

In the budding stage you don't need to worry about keeping your plants compact so you use a bulb with more red light (lower color temperature). The higher amount of hormones under light with a higher red content is going to give you a better yield.

Blue: low auxin levels
Green: high auxin levels but not efficiently absorbed by plants. Will cause elongation.
Red: medium auxin levels
Far Red (720-780nm): high auxin levels but far red is not photosynthetically active radiation. Can be used as a supplement.

BTW, I have 120 watts worth of LEDs and they're a scam. Even the high power 5 and 15 watt LEDs (from LEDEngin) are no better than CFL in side by side testing. Give them a few years.
 

del66666

Well-Known Member
please could someone tell me if these cfl bulbs that i keep hearing about are n e thing like envirolites? cheers
 

REEFA

Active Member
Envirolites are not like cfls They ARE cfls they are just specially designed for growing because they are pretty bright and very energy efficient.REEFA
 

REEFA

Active Member
:joint:Envirolites are not like cfls They ARE cfls they are just specially designed for growing because they are pretty bright and very energy efficient.REEFA
 

REEFA

Active Member
best use blue for veg and red for flower or even better use both, red may stretch things but is good for resin production when flowering,but if thats all you got there aint a choice
So what are you saying? It Can be done or theres not really any point because my weed will turn out sh*t, Im using a lowryder strain and i think i read some where on this forum lowryders will grow whatever the spectrum, ( dunno if thats true as this is y 1st grow) Can anyone Verify that? Reefa
 

del66666

Well-Known Member
sometimes you got to use what you have,just go for it and learn, you should see my fuck ups,never done lowryder but reckon they will prob b ok have fun.
 

REEFA

Active Member
Cheers, The pic of the white rhino plant you got in your bath tub is fu*kin sikk its so
compact And since i am doing a stealth grow Thats my cup of tea :D is that the maximum size she'll grow to and how long is Her Total life cycle ?
 

ImarriedMARY

Well-Known Member
My cat is pretty pissed off at me as she doesn't like the T5's, she likes the HIDs as she believes the grow room is hers when the HIDs are running and she loves the heat associated with it, the only time she leaves the room is when the lights are off, or to eat and use the litter-box. When the T5's we're the only lighting used, she wasn't a happy camper....

haha my cat's the same way with cfl's she loves being in there (even when i'm not) she keeps an eye on my plants she checks them out and looks at them (never trying to eat it) she's my little stoner cat :bigjoint:


so me being the loving nice dad that i am i created a spot for her not to go blind by the light but she can also enjoy what very little heat comes off and at the same time watch my plants that black cat is the same as my cat lol (black)
 
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