ukscroger Posted September 6 Share Posted September 6 (edited) I don't see many people here using it and think that's probably wise. There's a whole lot of conflicting and contradictory information out there. I found a good paper which might explain the positive home grower reports and Bugbee's comments saying the opposite. If he cannot find anything along with Guelph Uni repeating 4x and also finding nothing I would tent to trust that. Then Shanes video came out showing definite improvements in 1 paper by Dutch Passion. I found a reddit poster who said he's run 4 tests with varying intervals and 15min per day gives the best results but the bulbs don't last (really don't like cycling so you don't get more lifetime despite running less minutes). He said he now uses it for 24hrs between runs for sterilising only -which I reckon makes financial sense considering some results: Better looking sugar leaves More content in sugar leaves Less content in the buds https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9551646/ https://www.youtube.com/watch?v=NvINwsf6cFw Edited September 6 by ukscroger Found a new Bugbee video saying most of this. 1 Link to comment Share on other sites More sharing options...
green_machine Posted September 6 Share Posted September 6 (edited) Thanks for posting this @ukscroger I found it informative. I recently added UVa and UVb to my 2x4 grow tent and know that 30 mins UV exposure during veg completely fried my plants I saw extensive damage. I had turned off the UV and was going to try shorter exposure periods during flower so it was constructive to see that they were getting good results with short UV exposure times. My current plan is to start again with the UV light during week 4 of flower, and then increase it each week by 5 minutes till I hit a maximum exposure of 15 minutes at week 6 after this I would stop the UV and allow the plant to finish growing without it. I use one of the migro UV lights. Edited September 6 by green_machine spelling 2 Link to comment Share on other sites More sharing options...
ukscroger Posted September 6 Author Share Posted September 6 From the post : enough supplemental UV for a 4x4? on microgrowery subred. Youtube then did it';s thing and recommended a random video with 3500views that shows amazing results from under canopy lights which would be a far better investment for everyone looking into UV and IR bars https://www.youtube.com/watch?v=ZA4tcWkO5Dc 1 Link to comment Share on other sites More sharing options...
DeltaMelter Posted September 6 Share Posted September 6 I use them (2 x 60W Solarcure T5 bulbs) but I think the benefits are marginal. If used during veg (as @green_machine found) you can cripple your plants. I accidentally screwed up a timer and blasted 3 Holy Grail Kush plants with UV like this for 2 hours. They never grew over 18 inches even though the mum they were cut from was a 4ft plant. It totally stunted them. The flowers were different too and quite weak. I have applied the same stress unwittingly during early flower too and it does reduce stretch but I'm not sure at what cost. I now use it in very short bursts (15mins) as it "tickles" the plants and does seem to stimulate diferent resin profiles. I would say its "stronger" but it seems more 'medicinal' and the terps are different. Not better as such - but different. I haven't switched them on at all during my current run though. You can very easily damage plants so I wouldn't recommend them to most growers - you might get more/same benefit from CMH lights instead. Just my 2p. 3 1 Link to comment Share on other sites More sharing options...
DeltaMelter Posted September 6 Share Posted September 6 What I need to do (one day!) is a test run with 9 clones in the 4x4 and just one UV light - that way only half the plants (positioned carefully probably just 3 plants) will get hit with the UV and I will be able to do a direct comparison, same clones same environment and feeds with the only differnce being half get the UV and half don't. Anecdotally - I have no UV in the 3x3 and the plants are less "terpy" when flowered in there - but that could be a number of things like light intensity, temps and airflow so I don;t really read into that much. 2 Link to comment Share on other sites More sharing options...
Herbal Kint Posted September 6 Share Posted September 6 Am totally in,just have to buy it first Ill report back in here 2 Link to comment Share on other sites More sharing options...
ukscroger Posted September 6 Author Share Posted September 6 15 minutes ago, Herbal Kint said: Am totally in,just have to buy it first Ill report back in here There's more positive reports from under canopy lights. I'm going to add those first. I might add UV and try a side by side one day. 1 Link to comment Share on other sites More sharing options...
Herbal Kint Posted September 6 Share Posted September 6 All right,never heard of those,i was looking into Lumatek uvAB 1 Link to comment Share on other sites More sharing options...
Military Grade Posted September 6 Share Posted September 6 (edited) My last grow had Blueberry Muffin that I decided to keep a cut of, that wasn't grown with UVA but this grow now I'm growing a cut and going to be using the UVA bars this time round to test the difference. The strain is already super terpy Blueberry Gum is how it stands atm be interesting to see how it differs, will it be the same profile but more pronounced or with it change the profile with the addition of new terps caused from UV. Dr Bruce Bugbee was on the Dudes grow show the other day discussing UV lights effects on cannabis. Edited September 6 by Military Grade 1 Link to comment Share on other sites More sharing options...
Shumroom Posted September 6 Share Posted September 6 That's the Mantis from Grow The Jungle in one of my flowering areas Only time I don't use it is when plants are too close to the lights. oops. I'm going veg for less time in future 4 hours per day after around 4-5 weeks of 12/12 Atb 3 Link to comment Share on other sites More sharing options...
ukscroger Posted September 6 Author Share Posted September 6 Shane's just dropped a new one on under/inter canopy lighting 1 Link to comment Share on other sites More sharing options...
DeltaMelter Posted September 6 Share Posted September 6 LOL I've just starting watching it too! Just dropped! 1 Link to comment Share on other sites More sharing options...
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