• Home
  • Forums
  • Medical Cannabis Cultivation
  • General Indoor Growing
  • Should I add UVB Light?

Should I add UVB Light?

  • Thread starter Thread starter LaVirtue
  • Start date Start date Feb 19, 2021
  • Tagged users Tagged users None

Should I add UVB Light?

LaVirtue Feb 19, 2021 561 Replies 103,967 Views
Page 2 of 29 · Replies 21–40 of 562
Prev
  • 1
  • 2
  • 3
  • 4
  • …
  • 29
Next
First Prev 2 of 29 Next Last

Madmax

Posts
4,733
Reactions
9,126
Joined
Jul 4, 2018
Points
313
Feb 19, 2021
#21
Dont cmh and t5s have small % of uvb...
 
Reactions: LaVirtue and MIMedGrower
Quote Reply

MIMedGrower

Posts
17,190
Reactions
53,530
Joined
Feb 17, 2017
Points
438
Feb 19, 2021
#22
Madmax said:
Dont cmh and t5s have small % of uvb...
Click to expand...


yes. And the first time i saw the results of the uvb bump was a guy with a big commercial operation testing cmh vs hps vs blurple led. The cmh weed came out 4% higher in thc than the other two clones. He had his own professional testing equipment.
 
Reactions: j1sonbrother, tobh, LaVirtue and 1 other person
Quote Reply

Madmax

Posts
4,733
Reactions
9,126
Joined
Jul 4, 2018
Points
313
Feb 19, 2021
#23
Maybe i could throw a couple t5s in there ..they could b kept on 12hrs too .i know its minimal
but something is better than nothing i spose...these could b put 8 inches above canopy on a certain plant just to test.
 
Reactions: LaVirtue
Quote Reply

MIMedGrower

Posts
17,190
Reactions
53,530
Joined
Feb 17, 2017
Points
438
Feb 19, 2021
#24
Madmax said:
Maybe i could throw a couple t5s in there ..they could b kept on 12hrs too .i know its minimal
but something is better than nothing i spose...these could b put 8 inches above canopy on a certain plant just to test.
Click to expand...



regular t-5’s dont have enough uvb but there are full spectrum plus uv bulbs and uv specific from hortilux and htg and others.
 
Reactions: PiffinOut, LaVirtue and Madmax
Quote Reply

LaVirtue

Posts
128
Reactions
187
Joined
Feb 18, 2021
Points
43
Feb 19, 2021
#25
MIMedGrower said:
I wish everyone would stop saying it like a marketing ploy. The max recorded thc bump is 4%. The big number is of total weight. An example is 20%thc to 24% thc. And thats the rare maximum amount. Also only thc raises. Not cbd or other cannabinoids. Which is useless for a better high. Only good for more profit if the dispensary is pricing according to thc content.

if it mattered so much indoor hps weed wouldnt be more potent than outdoor with the full sun spectrum. But outdoor rarely is more potent than well grown indoor.
Click to expand...

Very interesting that only the THC goes up....
 
Reactions: testiclees
Quote Reply

LaVirtue

Posts
128
Reactions
187
Joined
Feb 18, 2021
Points
43
Feb 19, 2021
#26
Moe.Red said:
Yes, I have read (I assume most of?) them. I did not achieve that result with that large a UV source. I received no result with the little T5s. At least in my lab. But there are way to many variables for me to say it does not work, just that it is not some magic bullet.

I'm starting a new thing right now every Friday I am going to TLC test something. Tonight it is testing cannabinoids in 4 buds from a recent harvest. I also took samples of the same buds to a lab yesterday and I will have the mass spectrometer results on Monday or Tuesday. I'm using this opportunity to verify my at home TLC testing is accurate.

This is how I know what is happening in my plants as I make changes like adding UV.

In my other 4x8 I just installed 60W Far Red and 60W UVA. I'm about to move a group of plants into that tent to flower, and we will see the effects of those 2 spectrums as they grow.

All of this testing is about coaxing out minor cannabinoids. I've got a feel for how to tune a plant backed by personal testing.

Gotta go upload the video, I'll be back later if you want to get deeper into UV. Post the link to a study so we are talking off the same paper. I'd be interested in anyone's thoughts on UV A B or C
Click to expand...

Wow this is really advanced - thanks to everyone for all the great information.
 
Reactions: Moe.Red
Quote Reply

Aqua Man

Posts
26,479
Reactions
59,693
Joined
Jun 12, 2018
Points
638
Feb 19, 2021
#27
@Moe.Red curious how ya ran those?
 
Reactions: LaVirtue and Moe.Red
Quote Reply

Moe.Red

Posts
5,044
Reactions
14,102
Joined
Jul 19, 2020
Points
313
Feb 19, 2021
#28
Aqua Man said:
@Moe.Red curious how ya ran those?
Click to expand...

The long way across the back next to the HID shrouds so it only really hit the back 3 plants. Ran 6 Critical Mass clones from a monster producer mom. 2 Hours in the middle of the day.

Plants were huge but very uneven top to bottom. Back 3 plants done way before the front 3.

Whole tent was over 4# dry but I do not attribute that to the UV by any stretch.

I've got the whole thing on gopro if you have specific questions.
 
Reactions: LaVirtue, Aqua Man, Madmax and 1 other person
Quote Reply

Aqua Man

Posts
26,479
Reactions
59,693
Joined
Jun 12, 2018
Points
638
Feb 19, 2021
#29
Moe.Red said:
The long way across the back next to the HID shrouds so it only really hit the back 3 plants. Ran 6 Critical Mass clones from a monster producer mom. 2 Hours in the middle of the day.

Plants were huge but very uneven top to bottom. Back 3 plants done way before the front 3.

Whole tent was over 4# dry but I do not attribute that to the UV by any stretch.

I've got the whole thing on gopro if you have specific questions.
Click to expand...
For what stages if growth?
 
Reactions: LaVirtue
Quote Reply

Milson

Supporter
Milsonian
Posts
3,376
Reactions
8,849
Joined
Jun 9, 2020
Points
263
Feb 19, 2021
#30
MIMedGrower said:
I wish everyone would stop saying it like a marketing ploy. The max recorded thc bump is 4%. The big number is of total weight. An example is 20%thc to 24% thc. And thats the rare maximum amount. Also only thc raises. Not cbd or other cannabinoids. Which is useless for a better high. Only good for more profit if the dispensary is pricing according to thc content.

if it mattered so much indoor hps weed wouldnt be more potent than outdoor with the full sun spectrum. But outdoor rarely is more potent than well grown indoor.
Click to expand...
I think there may be some other factors contributing to the potency of outdoor vs indoor in America.....like the climate in general for the vast majority of the country just sucks for growing pot.
 
Reactions: elusiveshame, Gary86, LaVirtue and 3 others
Quote Reply

Aqua Man

Posts
26,479
Reactions
59,693
Joined
Jun 12, 2018
Points
638
Feb 19, 2021
#31
MIMedGrower said:
I wish everyone would stop saying it like a marketing ploy. The max recorded thc bump is 4%. The big number is of total weight. An example is 20%thc to 24% thc. And thats the rare maximum amount. Also only thc raises. Not cbd or other cannabinoids. Which is useless for a better high. Only good for more profit if the dispensary is pricing according to thc content.

if it mattered so much indoor hps weed wouldnt be more potent than outdoor with the full sun spectrum. But outdoor rarely is more potent than well grown indoor.
Click to expand...
Well it is an increase of say 20%... say 20% thc and you see a 20% increase... that would be a total of 24%... thc content increased by 20%. But yeah kinda misleading.
 
Reactions: elusiveshame, testiclees, crustycorcus and 4 others
Quote Reply

Milson

Supporter
Milsonian
Posts
3,376
Reactions
8,849
Joined
Jun 9, 2020
Points
263
Feb 19, 2021
#32
Aqua Man said:
Well it is an increase of say 20%... say 20% thc and you see a 20% increase... that would be a total of 24%... thc content increased by 20%. But yeah kinda misleading.
Click to expand...
If you are adding percentages like that so you think it goes up by twenty percentage points, it's just something you need to learn not to do. That is kind of basic math literacy.
 
Reactions: Gary86, King2324, testiclees and 6 others
Quote Reply

MIMedGrower

Posts
17,190
Reactions
53,530
Joined
Feb 17, 2017
Points
438
Feb 19, 2021
#33
Milson said:
I think there may be some other factors contributing to the potency of outdoor vs indoor in America.....like the climate in general for the vast majority of the country just sucks for growing pot.
Click to expand...


eh. Outdoor is hit or miss wherever it comes from imo. I had a line on cali outdoor and mexico in the past. It varies too much to compete with indoor for me.

but climate controlled light dep greenhouses blur the line for sure.
 
Reactions: LaVirtue, Kanzeon and Aqua Man
Quote Reply

Moe.Red

Posts
5,044
Reactions
14,102
Joined
Jul 19, 2020
Points
313
Feb 19, 2021
#34
Aqua Man said:
For what stages if growth?
Click to expand...
Flower only
 
Reactions: LaVirtue and Aqua Man
Quote Reply

MIMedGrower

Posts
17,190
Reactions
53,530
Joined
Feb 17, 2017
Points
438
Feb 19, 2021
#35
Milson said:
If you are adding percentages like that so you think it goes up by twenty percentage points, it's just something you need to learn not to do. That is kind of basic math literacy.
Click to expand...


its a sales or negotiating tactic. You move the numbers around to suit the purpose at hand. Part of good sales training.
 
Reactions: Gary86, LaVirtue, Kanzeon and 1 other person
Quote Reply

Aqua Man

Posts
26,479
Reactions
59,693
Joined
Jun 12, 2018
Points
638
Feb 19, 2021
#36
Moe.Red said:
Flower only
Click to expand...
That may be why... only use the last 2 weeks ish... its a stress response... so that likely why you see more trixhs as a stress response but by the time late flower has come its adjusted and not going to get the same impact... at least that's my thought on it.
 
Reactions: LaVirtue
Quote Reply

Aqua Man

Posts
26,479
Reactions
59,693
Joined
Jun 12, 2018
Points
638
Feb 19, 2021
#37
MIMedGrower said:
its a sales or negotiating tactic. You move the numbers around to suit the purpose at hand. Part of good sales training.
Click to expand...
Yup yup
 
Reactions: LaVirtue and Kanzeon
Quote Reply

Dub_City405

Posts
919
Reactions
1,211
Joined
Jan 7, 2021
Points
143
Feb 19, 2021
#38
But then again thats your opinion but your opinion isnt fact unless youve done IT. I had wedding cake. Grew harvested and tasted at the same time. 1. Under 1200w hps nanolux got little uv. 2. Under gavita no uv. 3. Under my mars with uvb supplement. Id have to say my most sticky was the uvb. Same strain 3 different rooms. Same time. Side by side. I saw noticeable ro invest 100 or so in uvb to make a nice positive difference.
 
Reactions: CannabiscoJ, LaVirtue, MIMedGrower and 1 other person
Quote Reply

Milson

Supporter
Milsonian
Posts
3,376
Reactions
8,849
Joined
Jun 9, 2020
Points
263
Feb 19, 2021
#39
MIMedGrower said:
its a sales or negotiating tactic. You move the numbers around to suit the purpose at hand. Part of good sales training.
Click to expand...
Lol. I guess it depends on the business. Sales guy shows he's that dumb once, he is wasting his time with me (and I tell him so). But that's in tech solutions so I guess you are trying to show you are smart.

Edit: I am sorry, this came off as prickish. I am in a bit of a mood today after having a tense conversation with a vendor this afternoon who was a classic blowhard sales guy with no wagon behind him. It has me punchy on that topic.
 
Last edited: Feb 19, 2021
Reactions: LaVirtue, Kanzeon, MIMedGrower and 2 others
Quote Reply

Moe.Red

Posts
5,044
Reactions
14,102
Joined
Jul 19, 2020
Points
313
Feb 19, 2021
#40
I started with the little lights and moved up to the 4 footers to try to make something happen.

I’d be happy to run the test again on my tent in flower. The one you helped me on. Hooks and power already in place it would take 10 minutes to put them in.
 
Reactions: LaVirtue and Aqua Man
Quote Reply
Page 2 of 29 · Replies 21–40 of 562
Prev
  • 1
  • 2
  • 3
  • 4
  • …
  • 29
Next
First Prev 2 of 29 Next Last

Thread info

Replies 561
Views 103,967
Started Feb 19, 2021
Latest post Jun 7, 2025
Starter LaVirtue
Forum General Indoor Growing

Latest posts

  • D
    Cpurola's Outdoor grow in Southeast Michigan 2026
    • Latest: Dankster47
    • 19 minutes ago
    General Outdoor Growing
  • S
    Bannana purple punch f3 fast buds
    • Latest: stet
    • 28 minutes ago
    Grow Diaries
  • N
    Auto Flowers Odd growth Help
    • Latest: Nalali
    • 29 minutes ago
    Cannabis Infirmary
  • Weak RSO? Error in process or something else?
    • Latest: logic
    • Today at 3:17 AM
    Concentrates & Processing
  • T
    My 2025 dry ice kief process
    • Latest: TheIslandIsGreen
    • Today at 2:55 AM
    Cannabis Harvesting & Curing
  • Home
  • Forums
  • Medical Cannabis Cultivation
  • General Indoor Growing
  • Should I add UVB Light?
  • Contact us
  • Terms and rules
  • Privacy policy
  • Help
  • Home
Community platform by XenForo® © 2010-2026 XenForo Ltd.
Menu
Log in

Sign up

  • Home
  • News
  • Classifieds
  • Forums
    • What's new Featured content New posts New Articles New articles New products Latest activity
  • Social
  • Strains
  • Live
  • Learn
  • Brands
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?