I don't think he'd disagree. It's just that picture is not the best for comparing. A bit closer would be awesome.
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UVB VS NO UVB Side by Side
- Thread starter Green_science
- Start date
I don't think he'd disagree. It's just that picture is not the best for comparing. A bit closer would be awesome.
Green_science
Active member
Heres one a little closer, SO FAR plants with UVB supplementation have a stronger bouquet and have a higher trichome content, I will get pics of the them once they have finished drying to see if a visual difference is stil apparent and note the difference in pungency
After this we will do a smoke test.
Mean time I will try and arrange a GC
https://www.icmag.com/ic/picture.php?albumid=44684&pictureid=1101861
After this we will do a smoke test.
Mean time I will try and arrange a GC
https://www.icmag.com/ic/picture.php?albumid=44684&pictureid=1101861
hereigrow
Member
Awesome thread.. so r you trying to replicate the uvb outdoors on indoor crops? Wouldn't it b easier to test the same strain grown indoor and outdoor/greenhouse? Northern cali is said to have a similar climate to the hindu kush mountain...I think your on to something. I liked the bus on the right in the pic better. So which one had the uvb?
Excess UV-b can stunt growth in some plants. This is when they are exposed to UV-b levels higher than they'd find normally. I think there may be a fine line between UV-b benefit and liability.
GS- Any gut comment on UV-b affect on yield? I think it's easy to OD on UV here. JKD got me thinking and while a little seems good, exceeding what is found in nature seems bad. The one main reptile light place has data regarding strength and distance. I should check that out again.
GS- Any gut comment on UV-b affect on yield? I think it's easy to OD on UV here. JKD got me thinking and while a little seems good, exceeding what is found in nature seems bad. The one main reptile light place has data regarding strength and distance. I should check that out again.
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Pepe le skunk
Member
It's called the inverse square law.
In physics, an inverse-square law is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity. In equation form: blah blah. look it up.
Anyway some treats rolled this way and they sure are nice.
I can only tell you it makes a difference. Just the extra light would help especially from the sides. I had them closer to some and further away from other parts because of the way they are hung. Allows for rotation every few days. Also helps with overall light coverage on all parts when you turn them.
I wanted to say the right because they look more tan. My trich's actually took on a reddish color the closer they were. Will say the smoke is over the top, trippy. Smoked up a guy who cuts my lawn with only 4 hits and we were floating. And that was on some 1 week old after cut. It might calm down in a few weeks but wow. We were both baked beyond belief.
Up close at 10X in the loope the trichs look like a whole other world.
D
DirkDiggla
Interesting experiment, the latest LED lights now include a small amount of UV as well as small amount of IR.
SirLikesAToke
New member
This is a grate thread looking forward to the smoke report 
Bongstar420
Member
Ive seen multiple cuts with and with out UVB with different temps, spectrum ratios, and humidities. All UVB displayed noticeably better bouquets. The total amount of THC is a closer call, but glands seemed slightly larger and more extended. Additionally, I have read lots of research showing there are UV receptors that upregulate the production of things like terpenes in other plants. Ive seen cuts that just look more dusted due to the trichrome stalk being white vs clear amber vs milky purplish. I always pontificate that trait is from the "White Family" since the seed parents were said to be related to White Rhino.
What you are seeing in the earlier photograph may be an increase in opacity of the trichrome rather than increase in the amount per square millimeter. If youd rather avoid a laboritory analysis, you could do a few side by side hash batches. Measure the bud, hash it, measure the bud and the hash. Do that multiple times to multiple samples. Make sure to average things and be consistent in the process.
What you are seeing in the earlier photograph may be an increase in opacity of the trichrome rather than increase in the amount per square millimeter. If youd rather avoid a laboritory analysis, you could do a few side by side hash batches. Measure the bud, hash it, measure the bud and the hash. Do that multiple times to multiple samples. Make sure to average things and be consistent in the process.
Bubbleblower
Member
D
Drek
So, is this the most anticlimactic thread in existence? It was just getting good with the anticipation of the smoke test...and then poof...gone.
So, is this the most anticlimactic thread in existence? It was just getting good with the anticipation of the smoke test...and then poof...gone.
Blurry pictures shot against a denim background aren't a good climax? Hehehe
I was stoked when I started reading....... poor thread just rolled over and died.
Bubbleblower
Member
If you use that much UVB -relatively- the benefits no longer outweigh the harmfull effects.
The 13.4 kJ/m2 number from the research was the total UVB irradiance each day which translates to 3.72W/m2 or 0.46W/m2 for 8 hours.
If we take sunlight as example we need about 0.45% UVB, 8.55% UVA and 91% > 400nm. The ratio needs to be right to mitigate the damaging effects of UVB.
The only way to get close to it, unless we are millionaires, is by using a 2% UVB lamp.
Wether it will increase THC content is highly debatable, but it certainly has a lot of other benefits.
The 13.4 kJ/m2 number from the research was the total UVB irradiance each day which translates to 3.72W/m2 or 0.46W/m2 for 8 hours.
If we take sunlight as example we need about 0.45% UVB, 8.55% UVA and 91% > 400nm. The ratio needs to be right to mitigate the damaging effects of UVB.
The only way to get close to it, unless we are millionaires, is by using a 2% UVB lamp.
Wether it will increase THC content is highly debatable, but it certainly has a lot of other benefits.
