Trichomes, THC and UVB light.....
- Thread starter tahoe58
- Start date
Harkin
Well-Known Member
Ahh yeah the CFL, well the Fluorescents are suppose to be better for growing as it is much more spread, the cfl has a very concentrated beam, maybe it was a bit overdone mate, check this UV Guide UK - Ultraviolet Light for Reptiles - 2005 Reptile Lighting Survey
skunkushybrid
New Member
I do notice a difference between your plants... one is in flower and the other is in veg'. This might mean something.
Harkin
Well-Known Member
Also check this, you might want to get rid of the refelctor on the UVB mate if it's too much UV Lighting for Reptiles: Compact Fluorescent Lamps
skunkushybrid
New Member
The mercury vapour bulbs contain more UV-A, I believe. UV-B only makes up a small percentage.
Here's an interesting article on them.
High UVB Mercury Vapour Lamps in Zoos - Osram Ultra-Vitalux - ReptileUV Zoo Mega-Ray test results
Here's an interesting article on them.
High UVB Mercury Vapour Lamps in Zoos - Osram Ultra-Vitalux - ReptileUV Zoo Mega-Ray test results
cjsesh00
Well-Known Member
and interesting on the flowering time, these were force flowered, if I counted those 2 weeks of force flowering in theory (and some pistils did show up on days 3-5 of force flower) they are on week 7 then if this is correct. i usually wait til pre flowering so no unexpected males show up overnight to crash the party but my lease is up on this place after december so i wanted everything done by then so i could clean up. Leaves usually yellow and die off around week 7 generally so maybe its a combo of the reptile light and their age, could it be perhaps? maybe those leaves were fading anyways and the strong light blasted the already weak and dying leaves, although there is some nasty shit burnt into some of the buds too. maybe they become weaker at the end of their life span too and not very resistant.
skunkushybrid
New Member
I'm not sure why a tiny UV lamp like that would burn your plants. It doesn't seem intense enough. Did you feel any heat off it?
cjsesh00
Well-Known Member
no i didnt feel much heat and i keep the temps under control and have this entire grow. It has to be the CFL and the cone reflector I made from the mylar. I really have seen every problem from bugs, to root rot, nute burns and deficiencies, etc and this is a new look for my plants. not a fashionable accessory. I have two completely healthy unharmed blueberries, and 1 afghani that has slightly damaged fan leaves, and real crispy leaves on the main cola on the side that was facing the light. I have noticed this plant has been the strongest of all my plants this go round. It has been near perfect so this leads me to believe.... and I have a northern lights that was the most harmed by it. all the fan leaves went wacky and fell off within 2 days. the buds are fine and it actually has only white hairs. not one orange yet. But it is just buds on a stick right now.. I have a another plant that was given to me when young and I am not sure what it is, but it has several buds on it. very branchy plant, ALL fan leaves have fallen off and these ones turned burnt and crispy and curled upwards, the sugar leaves within the buds look brown on the side that was facing the lamp. so on and so forth. All I have concluded is that having not force flowered before I could be off on the timing of this UV light, I was planning on hitting them midway into flower but if they are indeed 7 weeks old (even though they look more like 5 or 6) then they must not be very resilient when this mature or past their prime I should say. The odd thing is since using this light as well they have lost their aroma. when i put my face in them the sweet smell is gone and they smell like plain old vegetation. what have I done!!
cjsesh00
Well-Known Member
i have six plants, two rows of 3. two HPS suspended over top, one 400w, one 175w. I happened to have two lights and a 400 would prob suffice but this 175 is quite a complement. Didnt plan it this way, I have just acquired them both luckily. I clamped the uv light to a bar at the end of the table, the long end, prob a foot out and a foot above the tops, but some plants are significantly taller, so @ about 12" diagonally from the closest 2 plants , and at a 45 maybe steeper as to hit most of the plants from an angle, the next closest 2 were maybe 24" away, and the blueberries were at the opposite end about 3ft away. the layout is more or less a rectangle, 2x3. yeah it is a sunburn for sure, I have pistils turning brown now on just the sides that were facing it. it is progressively getting worse. definitely the light. if I had just dropped it directly centered and above them, maybe if i had taken the hood off the lamp and just suspended the naked CFL bulb between the two HPS that are right over head this wouldnt have happened. It seems as if the light was so concentrated from the mylar cone (pretty narrow cone too) around the bulb. that first day it ran for a few hours but with the neck being so adjustable on the lamp I would redirect its aim every 20-30 minutes, the second day things seemed funny and I only ran it for a little bit, and my sister came over for about 30 minutes that day and I shut it off and the 400w light( it looks like a tanning salon in my closet, but just the 175w lamp is very discreet and can keep things going by itself for a very short period time). I never turned the uv bulb on after that bc I had a basketball game and was going to be gone when the lights timed off and I didnt want it running and didnt know if i'd be back that night. then the next day I noticed major problems and even today as the time goes on its getting exponentially worse. Enough tension and stress that I have to write these long watered down messages to keep my sanity, and I have nobody to talk to about it, I live in Utah and I am one of few on this side of town that enjoy such things. Salt lake is amazing, but i am about 45 minutes out.
skunkushybrid
New Member
It may also depend on the quality of your bulb. From what I've been reading these old UV bulbs are nothing like the sun... whereas the mercury vapour are suppose to be as close to the sun UV as you can get.
skunkushybrid
New Member
I think they're good, or at least better now than back then... I don't know. wtf?
Plants grow in UV all the time... your little bulb shouldn't have caused that much damage unless your strain is genetically unused to UV.
I can see this happening to a lot of the modern strains. Breeding indoors leads to domestication of the plant, and this can happen very quickly.
Maybe it's because they are in flower. During the plants natural cycle there would be less UV getting to the plants anyway... and if they didn't have any during veg' this would lead the plant to believe it is an environment with very little UV. I think adding it this late to your grow may have shocked the plant, in that it has had very low UV levels up to now.
You changed the environment too late into the plants life. i believe cannabis would need it in veg, so that the plant can build the necessary defense levels in its leaves. Just like an adult that's never had chicken pox, instigating UV at this late stage must be the reason for the effects.
cjsesh00
Well-Known Member
yeah I thought the same thing. they must not be used to it, its like spring break, I always go to mexico after a long snowy winter and get torched every yr. But I have not been counting my two weeks of force flower as part of their flowering period, bc I have not force flowered and i think i read a bad article that said 2 weeks force flower THEN 6,8,10,12 wks of flowering followed. but I think that size wise they look 5 or 6 wks flowering, but in reality its more like 7. way too late to drop the UV bomb
cjsesh00
Well-Known Member
I will try it again in the future and start with small doses during VEG. get them a base tan first. I should pull an OZ off my 2 BB's anyways so I'm happy with that, these other ones we'll see how they turn out, I always like making cookies with butter I prepared from trim. Its not something you get to do often and I love the process. So if these 4 that were closest do fail i'm not down and out completely. but looks like they are done for all the way.
skunkushybrid
New Member
Was the plant pre-flowering when you put it in? You might still be ok, and the plant may have enough time to build defences.Great, I introduced the UVB as I started flowering
This must be the answer, can only be the answer for cjs' misfortune. We all know that cannabis survives much more intense UV in the wild... and that it also adapts readily to places with very little UV (ruderalis).
I think I'm going to need a UV lamp with a dimmer switch. Or maybe pull it out, then bring it further in while the plant is still a sprog. There is naturally less UV in the spring, when these guys pop the soil... and it's the most intense just as they start flowering.
hmmmm. this is taking a lot of thought. maybe we're on the wrong track....
cjsesh00
Well-Known Member
1. The mylar cone was very narrow, it had to of been concentrating a beam of rays.
2. I brought the UV light in much later than I should have. I am retarded and was off 2 weeks on my days flowering. a real stupid mistake on my part. but, my plants looked after the first two weeks of force flowering about how they would from pre-flowering a few weeks prior to changing the light cycle. so I didnt consider this, but have now learned its not the time flowering but rather nights of 12 hrs darkness that they need to mature. big difference. so this leads me to believe we can run our lights maybe longer during the day as long as we give them 12hrs of dark? just kidding, no more tweaking with things anymore. I am sticking to the basics.
I know how UV effects humans when introduced abruptly, it only makes sense it would do the same to these babies. Even if it is a relatively weak source of UV.
2. I brought the UV light in much later than I should have. I am retarded and was off 2 weeks on my days flowering. a real stupid mistake on my part. but, my plants looked after the first two weeks of force flowering about how they would from pre-flowering a few weeks prior to changing the light cycle. so I didnt consider this, but have now learned its not the time flowering but rather nights of 12 hrs darkness that they need to mature. big difference. so this leads me to believe we can run our lights maybe longer during the day as long as we give them 12hrs of dark? just kidding, no more tweaking with things anymore. I am sticking to the basics.
I know how UV effects humans when introduced abruptly, it only makes sense it would do the same to these babies. Even if it is a relatively weak source of UV.
Harkin
Well-Known Member
I had just started 12/12 when I introduced the light, and it flowered a few days later. It would make more sense to use the UVB from the beginning but I can't see why the plant wouldn't know what to do if introduced later on, you reckon it would loose the ability? And no I can't see why we are on the wrong track, we are only using light that it would naturally get right? How is that bad?
skunkushybrid
New Member
Thanks cjs', if anything else I've learned a lot from this mistake of yours. I wasn't even considering the veg' cycle, only the flower.
I think we all owe you one.
I think we all owe you one.