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UVB for THC and Terpenes

Rocket Soul

Well-known member
The migro uvb 310 tube is nice. I use it now the second time at a grow.
At the first time i increased too the recomended 2h over 2 weeks and let it run till harvest(min 2 weeks).

I can not say that it increased the terps but changed them to more pronounced imo. I got this strongest with the sensi star cut from vienna. Never had such strong celery aroma in that cut before, normally it won't smell like that. Took very long cure to develop a little sweetness in the smell and was almost smoked up at that time.

Can't also say that it's much stronger, maybe a little more but that could be placebo. But i did no side by side and that plant was also direct under the tube ~2ft away so maybe this got too much.

Coloration is dev enhanced by uv. More purple hues showed up. Now on the second try i will just use 15min uv in the middle of lighting phase at the last 2-4 weeks of flowering and already see my thai x panama getting more coloration.
Ive also hit this celery smell! I got it from oreoz apricot under our most aggressive uv supplement. I associated it with fast, volatile terps cause i got the same sans direct celery, but same volatile wondersmells from another cut. Not sure if i like the celery aspect but defo the volatiles.
My most reliable uv supplement has been 400/365 in 2:1 ratio. Unmistakeable improvement in smell without any weird stuff going on.
 

trixP

Active member
Ive also hit this celery smell! I got it from oreoz apricot under our most aggressive uv supplement. I associated it with fast, volatile terps cause i got the same sans direct celery, but same volatile wondersmells from another cut. Not sure if i like the celery aspect but defo the volatiles.
My most reliable uv supplement has been 400/365 in 2:1 ratio. Unmistakeable improvement in smell without any weird stuff going on.
Odd I have uv fr on my fixture never had this I run them full blast 2x40w bars
 

Rocket Soul

Well-known member
Odd I have uv fr on my fixture never had this I run them full blast 2x40w bars
That light is running 80w of wide reds and wide uv per m2 (365/385/400/660/680/730nm), its not just uv its a sorta exotic blurple supplement. Also running this over a fairly extreme flower spectrum.
 
Celery terps.. This is where we are in 2024.

I like the Marijuana terps personally. Just the strain no "terroir" please.



What the f-ck is a celery terp. And don't tell me it's the same as carrots or some shit I know what carrots smell like.
 

Rocket Soul

Well-known member
Celery terps.. This is where we are in 2024.

I like the Marijuana terps personally. Just the strain no "terroir" please.



What the f-ck is a celery terp. And don't tell me it's the same as carrots or some shit I know what carrots smell like.
Not sure what to say here, weed that smells like celery; the vegetable.
 

growmore15

New member
While reading up about UVC for killing spider mites I ran across several articles about using UVB for increasing THC and terpenes. They claimed 28% increase. Does anyone have information and/or experience with this?? The articles I read so far have been vague about how much light wattage, but seems like 12 hours a day, especially during switchover to flower. Also seems like you would need to shut them off and/or wear protective goggles when in room.

the Dutch Lighting Innovations CRI Series 150w UV light is a supplemental light with UV-A, UV-B and UV-C which you use for 2-3 hours a day. one of them can be used to supplement four (4) LEDs or 1000w HPS. not sure a better UV supplemental grow light exists
 

JKD

Well-known member
Veteran
the Dutch Lighting Innovations CRI Series 150w UV light is a supplemental light with UV-A, UV-B and UV-C which you use for 2-3 hours a day. one of them can be used to supplement four (4) LEDs or 1000w HPS. not sure a better UV supplemental grow light exists
DLI-CRI-Series-UV-150W-DE.png

Looks more UVA. Similar or the same spectrum as a 15000k to 20000k CMH or MH reef lamp.
 

Rocket Soul

Well-known member
DLI-CRI-Series-UV-150W-DE.png

Looks more UVA. Similar or the same spectrum as a 15000k to 20000k CMH or MH reef lamp.
Agree but i also think the UVA is the most important part, id be more concerned about the rest of the spectrum being somewhat wastefull. You can fairly clearly see that only about a third or less of those watts is going towards uv. So about 50w of UVA for 4x1000w leds (so 4x 5x5 trays) for around 3 hours. I dont know about this lights efficiency but around 12.5 W of this spectrum per 5x5 for 2-3 hours doesnt seem like it will go very far. Also doubting how one would mount and hang this in order to get a 100square feet spread, you would need to hang it really high
@growmore15 have you tried this light yourself ? If so what did your application look like?

Some pet peeving is how they represent their spectrum kinda weird: they pain 550nm yellow (should be green) and between 400-450 green (should be violet/blue) but thats not here nor there.
 

growmore15

New member
Agree but i also think the UVA is the most important part, id be more concerned about the rest of the spectrum being somewhat wastefull. You can fairly clearly see that only about a third or less of those watts is going towards uv. So about 50w of UVA for 4x1000w leds (so 4x 5x5 trays) for around 3 hours. I dont know about this lights efficiency but around 12.5 W of this spectrum per 5x5 for 2-3 hours doesnt seem like it will go very far. Also doubting how one would mount and hang this in order to get a 100square feet spread, you would need to hang it really high
@growmore15 have you tried this light yourself ? If so what did your application look like?

Some pet peeving is how they represent their spectrum kinda weird: they pain 550nm yellow (should be green) and between 400-450 green (should be violet/blue) but thats not here nor there.

It is hung very high, yes. it is a commercial fixture so not to be used in a home setting. DLI is the company the guys who started Gavita started after selling to Hawthorne. they are used throughout Eurpoe for commercial farming. one of the top lighting brands globally. many use it to protect against pathogens
 

Rocket Soul

Well-known member
It is hung very high, yes. it is a commercial fixture so not to be used in a home setting. DLI is the company the guys who started Gavita started after selling to Hawthorne. they are used throughout Eurpoe for commercial farming. one of the top lighting brands globally. many use it to protect against pathogens
Im more inclined towards leds for uv supplement. By now they are so cheap efficient and versatile that its hard to go wrong with them and removes the whole changing bulb issue. Though i admitt most led grow companies gough a fair bit on their led supplement and dont try to do a very good job at getting the uv spectrum right.

Have you seen a price on this bulb?

The way these uv lights stop pathogens is more that they toughen up the plants. If youre giving uv that kills bugs then the same uv will also hurt the plant.
 
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growmore15

New member
Im more inclined towards leds for uv supplement. By now they are so cheap efficient and versatile that its hard to go wrong with them and removes the whole changing bulb issue. Though i admitt most led grow companies gough a fair bit on their led supplement and dont try to do a very good job at getting the uv spectrum right.

Have you seen a price on this bulb?

The way these uv lights stop pathogens is more that they toughen up the plants. If youre giving uv that kills bugs then the same uv will also hurt the plant.

you can buy a LED that has UV-A built into the fixture
 

CannaRed

Cannabinerd
Im more inclined towards leds for uv supplement. By now they are so cheap efficient and versatile that its hard to go wrong with them and removes the whole changing bulb issue. Though i admitt most led grow companies gough a fair bit on their led supplement and dont try to do a very good job at getting the uv spectrum right.

Have you seen a price on this bulb?

The way these uv lights stop pathogens is more that they toughen up the plants. If youre giving uv that kills bugs then the same uv will also hurt the plant.
Have y'all seen the Internet ads for the grow light that "kills pests and pathogens". I figured it was a type of UV , but in the little bit of reading I did, it seems it's lights in the normal grow light spectrum, but some diodes are pulsing on and off. It said the pulsing patterns disturb the natural life cycle of bugs and fungi.
I'd love to know more about it, sounds too good to be true
 

Rocket Soul

Well-known member
Have y'all seen the Internet ads for the grow light that "kills pests and pathogens". I figured it was a type of UV , but in the little bit of reading I did, it seems it's lights in the normal grow light spectrum, but some diodes are pulsing on and off. It said the pulsing patterns disturb the natural life cycle of bugs and fungi.
I'd love to know more about it, sounds too good to be true
No idea, is there a link for it?
 

growmore15

New member
Have y'all seen the Internet ads for the grow light that "kills pests and pathogens". I figured it was a type of UV , but in the little bit of reading I did, it seems it's lights in the normal grow light spectrum, but some diodes are pulsing on and off. It said the pulsing patterns disturb the natural life cycle of bugs and fungi.
I'd love to know more about it, sounds too good to be true
The DLI CRI Series 150w UV light is very nice
 

Rocket Soul

Well-known member
I think this is the one.

Boulderlamp MoonWalker LED grow light

It uses near uv, 395-405nm. They provide a bunch of studies which seems very unrelated to cannabis. One of the studies actually shows that near uv would attract bugs (i think it was white flies) more than the other tested lights which is a funny way to advertise your bug and pest free light. Does anybody remember those uv bug lights that would zap flies with electricity?

My guess: if this feature is your main pest management then youre probably in trouble. I wouldnt see it as any kind of replacement for traditional ipm: hepa filtered intakes and standard environmental controls to minimize mold, quarantine for new clones from the outside etc.

Though im all for adding uv to your light due to it giving superior results in smells and the uv toughening up plants a bit; cant remember the explanation exactly but i think it was something in terms of stronger epitelial cells and thicker leaves.

This type of uv is beneficial in your grow imo; but i think boulder lights claims are sort of pushing claims for marketing as their links dont seem very related.
 
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