HLG 350R

CaseyQuinn

CaseyQuinn

Well-Known Member
I just bought one & super stoked. @PadawanWarrior reminded me & the RIU10 code saved me 50 bucks. Anyhoo, I just set up the new tent with her & transferred a Northern Lights girl I had in my Veg tent for 2 months. I have her at around 25" inches above her tops, at the moment to get acclimated to the new light. My reason for posting is, IF you own this light. Please do tell. I'd like to know you light intensity schedule. There's no #'s on the dial. So I have it on the 2nd click right now, & it seems stronger/brighter than the old light at 100%. lol. *She was under a 150 watt light (Maxsisun PB1000) in my veg tent yesterday (& the last few weeks at 100% power). SO, any HIG 350R owners that have a few runs with it under thier belt. Please let me know what has worked for you during veg & then different stages of flower. I usually ran 2 of the Maxsisun MF 1500's during flower on this schedule: *Weeks 1 - 3 of Veg. @ 25% power. **Weeks 3 of Veg to week 2 of flower @ 50%. ***Week 3 - 6 of flower @ 75%. ****Week 5 - 8 (or beyond) @ 100% Full Power. I'm super excited about this new HLG LED & looking forward to some Organic grows, starting now. I appreciate any feed back from the R.I.U. fam on light intensity levels (how many clicks or the angle of the knob in the case) & also how high you hang it above top of plant during growth. Thx. Again.
 

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CWF

CWF

Well-Known Member
I run mine 100% all the time, except when I first put the young plants under it that had been started under flouro T-5s. They got some light stress, so I raised the light and dimmed it down about a quarter turn. After about a week I cranked back to full. In 5th week of flower now and all is well. I keep the light about 15" above the canopy, but a couple tall buds are even closer with no signs of stress. GL HTH
 
CaseyQuinn

CaseyQuinn

Well-Known Member
CWF said:
I run mine 100% all the time, except when I first put the young plants under it that had been started under flouro T-5s. They got some light stress, so I raised the light and dimmed it down about a quarter turn. After about a week I cranked back to full. In 5th week of flower now and all is well. I keep the light about 15" above the canopy, but a couple tall buds are even closer with no signs of stress. GL HTH
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Appreciate the feedback. I know thier website says around 15" above canopy. But wanted to hear feedback from owners in use. I personally dont feel comfortable blasting her like that. So I will play with the new light a bit but will probably stick to my normal schedule. & put her about 2nd or 3rd click for now. Then turn it to 50% power in a week or two. Then when flip to flower soon I'll slowly raise it like I'm wise to & see how she does.
 
Rocket Soul

Rocket Soul

Well-Known Member
CaseyQuinn said:
Thank you for the feedback. This explains something I was wondering. So thx.
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No worries. You can Google it as High Irradiance Response theres a few articles.

In the end you're going to have to learn how to read the plants, some like more some less and generally it's very easy to overlight in initial stages with leds. Once their a bit light stressed they pussy out very easily.
CWF above has a fairly agressive lighting strategy, if it works for him all the more power to him. But our crops haven't been that keen on high intensity until mid flower. But then they can just take and take.
 
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CWF

CWF

Well-Known Member
Hmm. More to learn. I'm not getting any purpling, and as luck would have it, I'm pretty much exactly in the flowering column for Rh and temps. I'm going to check my PPFD levels again, and maybe move the light up. I have 8' ceiling, it is at 6' now.
 
MustGro

MustGro

Well-Known Member
Rocket Soul said:
Read up on VPD ;) this is what makes your plants drink properly, specially important under led lights; they don't heat the leaves in the same way as hid which makes them prone to not drink a lot.
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Do you know if there is a different VPD chart for people who use Co2? I was using this one.

vpdchart.com

VPD Chart

Vapor pressure deficit (VPD) chart & calculator for horticulture in controlled environment. Cannabis, tomatoes, leafy greens, cucumber.
vpdchart.com vpdchart.com
 
Rocket Soul

Rocket Soul

Well-Known Member
MustGro said:
Do you know if there is a different VPD chart for people who use Co2? I was using this one.

vpdchart.com

VPD Chart

Vapor pressure deficit (VPD) chart & calculator for horticulture in controlled environment. Cannabis, tomatoes, leafy greens, cucumber.
vpdchart.com vpdchart.com
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Wow, that's another nice one, with leaf temps incorporated. I usually use the one of Everest Fernandez, on openlabs. Does leaf temps as +- degrees.

With VPD I'd like to stress that it's not an end all indicator: first, these charts all seem to assume standard atmospheric pressure, which is also a factor in vpd (unless I totally f up my understanding of maths). It should be noted that most grows use a bit of negative pressure due to extraction.

Second: it's not the only determinator of plant transpiration.
CO2 and spectrum both have an affect on stomata aperture and transpiration. CO2 closes the stomata; the more CO2 in the air, the less need for the plant to breath in.
Spectrum: there are several peaks in the stomata aperture actionspectrum, mainly around blue and uv. 280ish (especially) and 360ish have peaks in response, aswell as 2 areas corresponding roughly with blue color peaks, so just over and again just under 450nm.

Now this is stuff that I can't say I'm a 100% on but from what I read it's activated by absolute light levels of blue, not relative.
So a 4000k on let's say half intensity will be less "transpiry" than 3000k on full intensity from what I gather.
This makes calculating exact values for environment so hard, since you'd also have to factor in spectrum/intensity or really blue radiant wattage. And that is if there wasn't more compounding factors.

So I don't think you should think of this as a chart to follow blindly, look at your plant first and use your understanding for all these interweaving factors and try to maximise transpiration while keeping temps a bit higher than normal; if your plant is drinking heavily it's also taking up CO2 and keeping your plant fed. It is likely you need a fair bit of humidity as this seems to help plants handle intensity.
Another way forward would be to just try to get a bit extra heat in your substrate, there's these horti heating pads blankets that might work well. Iirc this is what Moflo uses inorder to get his veg working in relatively cold environment. I would bet it would work in a CO2 environment with standard temps. Ymmv :)
 
hotrodharley

hotrodharley

Well-Known Member
Rocket Soul said:
No worries. You can Google it as High Irradiance Response theres a few articles.

In the end you're going to have to learn how to read the plants, some like more some less and generally it's very easy to overlight in initial stages with leds. Once their a bit light stressed they pussy out very easily.
CWF above has a fairly agressive lighting strategy, if it works for him all the more power to him. But our crops haven't been that keen on high intensity until mid flower. But then they can just take and take.
Click to expand...
Or you can buy a cheap quantum PAR meter and know exactly what your PPF is at any distance. What I did after my first crop of seedlings turned as white as carved ivory. Not a speck of green above the ground.
 
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