[Lysrgic]

Hi all. Soon I'll Finnish my new light system including 6 X Cxb35900 (3500k) with a liquid cooling system and was wondering if with this system, the plants are getting everything they need, or if maybe I have a week link in my light system? (1.2x1.2m grow tent)

I was reading in some forums that adding some far red less that will be turned on for 5-10 min after lights off, will ultimately give me more yield.

Now I'm not an expert, but I figured that the chin ease star led are pretty cheap, so maybe it worth the extra effort? Does any one have any experience or opinion on this method? Thx

[Phaeton]

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[jikko77]

did you added just the 730 nm led?
any uv?
anything else bwtween 700 and 730 nm?

far red have some other use, not only pr pfr change.
what i've found so far:

Originally Posted by jikko77

regarding the far red/ir ecc ecc:
the pigment related to this is the fitocromo (?), it change, according to different external input from pr to pfr (the peak is about 660nm and 730 nm)
limit the strench of the hypocotyl; provoke the antocianine(?) action; expand the colitedoni(?); a photoperiodic controll in the flowering stage.

(?) mean i don't know/ have found the traslation in english.

some where else i did read something on the shadow and the uses of far red to limit leaf covering other leaf plant, but it was rather a chit chat than a sci fi text.

[AvidLerner]

I use the Far Red leds 15-3w in a 2x2 for 45 minutes after lights out. works great. I see a shorter growing schedule by maybe 5 days. I also use Deep Red and IR all day for good thc development and strength. I use royal blue 12/12 aolong with cob 12/12 off cycles of each other 12 hours cob and then 12 hours royal blue, for veg to make close nodal growth and strong roots and stems. peace

[AvidLerner]

Originally Posted by jikko77

did you added just the 730 nm led?
any uv?
anything else bwtween 700 and 730 nm?

far red have some other use, not only pr pfr change.
what i've found so far:



(?) mean i don't know/ have found the traslation in english.

some where else i did read something on the shadow and the uses of far red to limit leaf covering other leaf plant, but it was rather a chit chat than a sci fi text.

I use Deep red all day along with IR. I leave the UV-B alone as it is not cost effective. the IR helps out for the lack of UV-B, I think. peace

[Lysrgic]

cheers guys' thx for the answers!

so after ridding carefully all your posts and doing a bit of a research (a good old post if anyone interested: https://www.icmag.com/ic/showthread.php?threadid=293711).

my main findings are:

1. far red light (660nm and 730nm for 20-30 min) before and after regular lights are on, will enhance plant growth and leaf size. - only at the flowering stage

2. when using cobs, you need to add far red threw the lightning cycle, since leds dont produce far red them self (730nm only). hps do produce this wavelengths

3.there are two different ratios of nm amount for far red lights during the worktime of the cobs, and after. now, the ratio for when the cob is on, is 1 to 4. and after cob goes off you should raise the amount of far red nm by 15-25% (for 10-15 min, and another 10-15 min before next cycle).

Now, first of all I just want to make sure im right and not writing just crap.

Second of all, If im using 6 cxb3590 with HLG240H-C1050B, how many WATS of far red will i need? any suggestion on a specific led or any Chinese manufacture on ebay will do the work?

thank for all the help

[jikko77]

i do know osram have a multiband far red starting from 700 to 730 nm, or at least i do remeber something like that.

and this is totaly imho: a mix of 3000°k and 5000°k (90cri and 80cri) would cover the par spectrum better than just a single 3000, 4000 and even 5000°k, leaving out just the 700nm pick.

this is a 3070 5000°k:



source: cutter.au

Originally Posted by AvidLerner

I use Deep red all day along with IR. I leave the UV-B alone as it is not cost effective. the IR helps out for the lack of UV-B, I think. peace

about the cost, have you valuated a reptil cfl? some have a 10% uv-b output, on the total nominal output.
if i've read it well the uv-b works on different photoreceptor, are you keeping a journal on that grow, Avid?


edit: removed some crap i wrote, after i did read the link provided.

[Dion]

Originally Posted by jikko77

i do know osram have a multiband far red starting from 700 to 730 nm, or at least i do remeber something like that.
if you think on watt the far red ammount should be on 34 or so watt.
do you have a quote for the far red ratio?
and this is totaly imho: a mix of 3000°k and 5000°k (90cri and 80cri) would cover the par spectrum better than just a single 3000, 4000 and even 5000°k, leaving out just the 700nm pick.

this is a 3070 5000°k:

View Image

source: cutter.au



about the cost, have you valuated a reptil cfl? some have a 10% uv-b output, on the total nominal output.
if i've read it well the uv-b works on different photoreceptor, are you keeping a journal on that grow, Avid?

did u read the posts by beta test team?

https://www.icmag.com/ic/showthread.php?threadid=293711

[jikko77]

Originally Posted by Dion

did u read the posts by beta test team?

https://www.icmag.com/ic/showthread.php?threadid=293711

i did now thanks

[olekingkole]

I use 4 Philips Greenpower 14 watt far red bulbs in a 12x12 room to trigger night cycles. This way I can flower with 13 hours of light/day. This shortens flowering time by roughly a week. I could probably push it to 13.5 hours/day. The only problem I've experienced is getting all timers sequenced properly. Digital timers make it easier. You have to be certain that the far red lights really come on for 10 minutes after lights out. If the plants don't go into flower quickly, you may have your timers mis-set. I also use 4 Agro-Max Pure UVB t5's for 1 1/2 hours/day in 6 15 minute intervals. These provide much more UVB than the reptile bulbs.