Lighting Small UVB Experiment.

[Feenix]

Hello, I had said I would do an unofficial test during this grow on two DP Auto Blueberry that are now ready. It is simply by isolating one plant and exposing part of it to a small 15w reptile bulb for 6 hours a day, while the other girl is not. If it helps potency, I should see it in two forms. From plant to plant, and from exposed buds to non exposed buds of the same plant.
If I determine there is a difference , I will arrange for actual testing of the samples to get the numbers.

These initial pictures are of poor quality and will be changed when I have better lighting in the room and the concrete trucks that have been sitting idling all day stop and the micros aren't shaky. I'm told just a few more days.

Test Day 1

They are isolated as you see. Nothing fancy.

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Blueberry 1 Day 35

Trichome progress is strong already

Blueberry 2 with UVB Day 32

BB2 Trichomes just starting

I don't propose that this will answer the question of UVB benefits definitively but it can't hurt.

 

[Corgy]

This is brilliant

....... Good luck with the setup and whatever the outcome, salutations for giving it a go

 

[BR549]

SCIENCE!!! for the win!

 

[Egzoset]

Salutations,

...isolating one plant and exposing part of it to a small 15w reptile bulb for 6 hours a day... ... I don't propose that this will answer the question of UVB benefits definitively but it can't hurt.

Wanting to try is good enough already. It seems reasonable to give them 6 hours, insects are influenced by UVA though i can't tell if plants are the same. That could be for your next challenge! I mean Who knows!...

This is brilliant...

I concur absolutely: actually i can see the light, euh... Have your sun-glasses!

SCIENCE!!! for the win!

I dunno if i'd give them 6 hours straight though. If i were a plant stressed by some mad laboratory rat torturing my family i'd want to grow poison stings! Or out of any means i'd eventually fall into despear... How about leaving it recover between pulses of UVB radiation instead, for 6 hours. An electronic timer can implement this, no? I'm thinking it must be like hot aluminium crucibles. If you let it cool it won't burn as much, so perhaps the leaves have a limited endurance capacity as well. Expressed in hours, maybe only minutes. Past the threshold point it's hit, otherwise UVB pulses can stimulate it again and again for a real benefit and little trade-offs i figure.

And if it was a sound suggestion to chop UVB light periods as evoked and some UVB burning phenomenon does occur nonetheless, well at least the damages won't be those of a continuous 6 hours exposure. My !

Good day, have fun!!

 

[Feenix]

Thanks for the kind words and encouragement guys.( I use guys generically so don't feel excluded ladies
I've used this bulb for the last year and have always been encouraged by the visual results, larger trichs were evident but I never had two of the same phenos to try this and with no true comparison as a benchmark a lot is unanswered.
I have always been impressed with a video made by Marijuana Man that explained the chemistry and mechanics of it, at least his interpretation, and his recommendation was 6-8 hrs. max to simulate the tropics. Having to start somewhere, its as good a place as any and one I have used often with no apparent detriment to the ladies.
What this will not address is the important factor of health. That is for serious researchers to answer. Having just hung my first LED, good eye protection is a must. Man is it bright and only 450w.

 

[Groff]

Nice dude! I have been long postponing setting up these lights myself. On every grow, something comes up that is more urgent. Normally a total room refurb lol .

subbing up.

 

[Feenix]

Nice dude! I have been long postponing setting up these lights myself. On every grow, something comes up that is more urgent. Normally a total room refurb lol .

subbing up.

Welcome, Man , I can't believe the stretch since just last night. I don't know if it 's the UVB or just the added reflectivity up close by the foam but they were about even when I set up and the BB2 is now at least 2 inches taller in less than 24hrs.
I just happened to have another piece of foam so now all three are tight in their own reflective cubby holes. Pics coming within the hour.

 

[Feenix]

Salutations,
I dunno if i'd give them 6 hours straight though. If i were a plant stressed by some mad laboratory rat torturing my family i'd want to grow poison stings! Or out of any means i'd eventually fall into despear... How about leaving it recover between pulses of UVB radiation instead, for 6 hours. An electronic timer can implement this, no? I'm thinking it must be like hot aluminium crucibles. If you let it cool it won't burn as much, so perhaps the leaves have a limited endurance capacity as well. Expressed in hours, maybe only minutes. Past the threshold point it's hit, otherwise UVB pulses can stimulate it again and again for a real benefit and little trade-offs i figure.

And if it was a sound suggestion to chop UVB light periods as evoked and some UVB burning phenomenon does occur nonetheless, well at least the damages won't be those of a continuous 6 hours exposure. My !

Good day, have fun!!

Egzoset, I don't want you thinking that I dismissed your sound suggestion off hand. If I didn't know this bulb so well I would jump on pulsing it until we figured it out. Its effective wavelength is so short, I even figured how much of the one leaf in the way would be burned, a necessary sacrifice. I was pretty close at 1". On the other hand I have seen it draw out bud from within bud in the final spurt of my last Blue Mystic. Amazingly, it also brought out the favored color in that section of the cola while the rest stayed a plain green. The whole aim of the exercise is to stress the plant into the defensive mode found in nature when exposed to strong UVB. The tropics are noted for the more potent landrace (sp?) strains and its the theory that the stronger UVB is responsible. If you haven't seen the vintage vid I refer to here.

Edit: (On the other hand, there's obviously a lot to be said for the Kush family from the higher cold altitudes but I suspect that the higher you go, the higher the UVB gets and the higher we get.)

 

[Feenix]

This is a surprise. In less than 24 hours.

Both BB about even

Less than 24 hours later. I think the stretch of BB2 is more from the reflectivity within the tight cocoon than the UVB.

 

[Feenix]

I forgot to mention that regardless of the results of this test, I'm retiring this bulb and getting off UV until I know more about the health issues.I know it has benefits and a down side. I'm not worried about UVB with a 12 inch effective wavelength but I don't know what comes along with it.