Jp.the.pope
Well-Known Member
About 10% of total wattage is what I use
Adding UV to COB
- Thread starter Tyleb173rd
- Start date
Tyleb173rd
Well-Known Member
So if I have 1000w over a 4x4 I should use 100w of UVB 15 minutes during hours 3-6?
MeGaKiLlErMaN
Well-Known Member
Because it happens at a strain dependent rate anyways... Since plants expect to be under the sun. Just like a tree knows it needs bark
Jp.the.pope
Well-Known Member
Time on is going to depend on preference and your distance from canopy. But yup that is basically how I calced it
Afgan King
Well-Known Member
Id do 4 minutes.
NaturalFarmer
Well-Known Member
My original question though is whether UV-B vs ANY UV light is the cause.......It is much more energy efficient to create UV-A unless I am mistaken.....
Here is the original study that most of this is based on......
This was in 1987 and the test never removed UV-A from the light.
http://www.readcube.com/articles/10.1111/j.1751-1097.1987.tb04757.x
"Ultraviolet-B (UV-B; 280-320 nm)-emitting lamps unavoidably emit ultraviolet-A (UV-A; 320-400 nm) and ultraviolet-C (UV-C; <280 nm) radiation."
https://www.ncbi.nlm.nih.gov/pubmed/15264957
Here is the original study that most of this is based on......
This was in 1987 and the test never removed UV-A from the light.
http://www.readcube.com/articles/10.1111/j.1751-1097.1987.tb04757.x
"Ultraviolet-B (UV-B; 280-320 nm)-emitting lamps unavoidably emit ultraviolet-A (UV-A; 320-400 nm) and ultraviolet-C (UV-C; <280 nm) radiation."
https://www.ncbi.nlm.nih.gov/pubmed/15264957
MeGaKiLlErMaN
Well-Known Member
You want both UVB and A. They hit it in different ways, I'm sure you could experiment. There are people here that grow with it and get better results with uv
NaturalFarmer
Well-Known Member
Interesting that you are so threatened with science.
HydroRed
Well-Known Member
I recently picked up (2) 4' T5ho fixtures and fitted them with Agromax UV-A Plus bulbs (10K). I would have opted for the "Pure UV" which gives off A & B but I didnt want more timers in my room or to have to worry about when I can/cant enter my room. From my understanding, UV light is beneficial for killing off mold/mildew in a room as well. Lots of people who run it claim their issues with powdery mildew have come to an end as well as better trich production on their buds.
VegasWinner
Well-Known Member
UVA is used in hospitals to kill bacteria in the Hvac system with t5 lights in blue spectrum.
HydroRed
Well-Known Member
I was reading that some hvac units come with a UVC as well since it is confined into the duct work an no worry of exposure to the UV. So this brings me to a quick thought me being a diy'er....
Couldn't one just build a "scrubber box" by connecting an exhaust fan into a box connected to a carbon scrubber and put a UVC light inside of the box while it scrubs the air? Then you can scrub the air in your room, and kill off mold/mildew/bacteria etc while freshening your room? All with no ill effects or worry of UV exposure.
whitebb2727
Well-Known Member
Uva works just as good. I use agromax 10k+uva. Works great. You can even run them full time. @HydroRed is running them as supplementation also.
whitebb2727
Well-Known Member
It is a horticulture bulb. I thought the same as other. UVB was needed. From what I've seen the uva is working just fine for tric production as well as no pm.
PSUAGRO.
Well-Known Member
UV-a,b both hit the earth's surface and I see plenty of PM on outdoor crops.........UV-c, mostly filtered by the atmosphere will kill mold/germs and" fuck up" your plants with moderate exposure (dna damage)....in an enclosed box attached to the ducting, sure go for it.
whitebb2727
Well-Known Member
True statement. Still doesn't change what I said. I never said to use uvc.
We know outdoors gets pm even with uva and b.
Thing is we are talking indoors. Using uv is just one of several things to be done to reduce the chances of pm.
I have not had pm since adding uva. I also run rh in the 40% range and have adequate air flow.
MeGaKiLlErMaN
Well-Known Member
If you flip the fan around and force air through using with an Ozone generator is helps to remove impurities from carbon filter extending life before you have to reactivate saving you money.
HydroRed
Well-Known Member
I've had PM a cpl times, but was able to keep it in check until harvest with natural organic methods. As fast as I go from cutting to flower, I dont use any systemic cures because I wont deal with the toxins or half lifes. Anything I can do to add a wall of protection with a non-chemical approach, Im all about it! @.15 per kwh Im looking at less than $6 a month to run both T5HO lights 12 hrs a day.
