UVB Lighting - Replicate UV Index of 12?

mudballs

mudballs

Well-Known Member
RM3 said:
I don't pay attention to wattage per sq ft or grams per watt or any of the stuff folks seem to fiddle with, I just grow for me. The ATI bulbs are 54 watt HO's 4 foot there are 3 True Actinics and 5 Coral Plus's, 6 GE 4100K's and 4 Plantmax 6500K

I can tell you they work !!!! check out the trics and smoke reports in this thread
https://www.rollitup.org/t/are-they-done-yet-what-does-done-look-like.853978/

sorry it looks I just answered a ?from the 1st page ,,,,, again
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knowledge is power they say. now we kind of have answer to tell other people interested in uv light supplementation based on your experimentation. 6.5w/sq.ft. of specialized lamps should do the trick. i still want to find the actual uvi and here is the best i got.
Each point on the Index scale is equivalent to 25 milliWatts/square metre of UV radiation
W/m² Eeff x 40 = UV Index
The T5 Arcadia D3 is rated at 109mW/cm2 at a distance of 40cm (about 16inches)
^^from an ICMAG.com UVB forum post
so
0.0109/m²x40=.436 UV Index
That's what (I think) we are working with. I can't find the actual numbers of the Actinics or Corals. If you have 8 'similar' UV bulbs then you have a UV Index of 3.488 at 16inches away.
YES! I have been working on that for like days! And my ballpark figure was close when I guesstimated 3 UVI.
to get a UVI of 12 you need 27 bulbs ;p
I wouldn't recommend it and if you monkey with these lights wear special eye protection or put them on a separate switch to turn them off while you are working with the plants.

edit:nomo ur bulbs may be actual tanning bulbs, perhaps much stronger than riddles. get the real irridiance ratings before you get more lamps.
 
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nomofatum

nomofatum

Well-Known Member
mudballs said:
knowledge is power they say. now we kind of have answer to tell other people interested in uv light supplementation based on your experimentation. 6.5w/sq.ft. of specialized lamps should do the trick. i still want to find the actual uvi and here is the best i got.
Each point on the Index scale is equivalent to 25 milliWatts/square metre of UV radiation
W/m² Eeff x 40 = UV Index
The T5 Arcadia D3 is rated at 109mW/cm2 at a distance of 40cm (about 16inches)
^^from an ICMAG.com UVB forum post
so
0.0109/m²x40=.436 UV Index
That's what (I think) we are working with. I can't find the actual numbers of the Actinics or Corals. If you have 8 'similar' UV bulbs then you have a UV Index of 3.488 at 16inches away.
YES! I have been working on that for like days! And my ballpark figure was close when I guesstimated 3 UVI.
to get a UVI of 12 you need 27 bulbs ;p
I wouldn't recommend it and if you monkey with these lights wear special eye protection or put them on a separate switch to turn them off while you are working with the plants.

edit:nomo ur bulbs may be actual tanning bulbs, perhaps much stronger than riddles. get the real irridiance ratings before you get more lamps.
Click to expand...

Where did you get the 109mw/cm2? (link?) Also you have some math mistakes. Didn't convert from cm2 to m2 and it's 250mw, not 25. That I believe would put you off by a factor of 100, so he has a UV index of 43.6 lol.
 
nomofatum

nomofatum

Well-Known Member
Found it: 1 millionth of a watt.

That puts one bulb at a UV index of 4.6 at 40cm. Redid the math myself.
 
nomofatum

nomofatum

Well-Known Member
mudballs said:
fine you email the australian meteorological dept. and tell them they have an error on their webpage.
http://www.bom.gov.au/uv/about_uv_index.shtml

and do your own damn homework next time
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I'm wrong, misread, 25 is right, 250 is normal midday summer level aka uv index of 10. Sorry mudballs, just trying to get the math right.

So I screwed up that number again, so we are back up to 43.6 at 40cm, damn, someone please check my math.
 
nomofatum

nomofatum

Well-Known Member
Intensity should drop at the same rate as the surface area of the imaginary cylinder grows compared to the 40cm baseline.
A = 2 π r h + 2 π r 2

Then we have to look at RM3's reflectors, if white, the back half of the UVB light goes poof, if aluminum, we can expect 50% of the back light to make it to the plants.

RM3, I think we can calculate your actual UVB now thanks to mudballs.
 
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RM3

RM3

Well-Known Member
nomofatum said:
Intensity should drop at the same rate as the surface area of the imaginary cylinder grows compared to the 40cm baseline.
A = 2 π r h + 2 π r 2

Then we have to look at RM3's reflectors, if white, the back half of the UVB light goes poof, if aluminum, we can expect 50% of the back light to make it to the plants.

RM3, I think we can calculate your actual UVB now thanks to mudballs.
Click to expand...
They are Aluminum
 
RM3

RM3

Well-Known Member
TheChemist77 said:
that is a grow ive truly never seen before, it looks great..arent the lights to far above?? i thought they had to be a few inches away even w/ that many bulbs...wow
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Thank You, I do things very differently than most :)
I try and explain it in my Light??? thread
 
racerboy71

racerboy71

bud bootlegger
RM3 said:
My Tanning Booth uses Oracle High Bays, nothing like the crap you see in hydro/grow stores. Very High Quality and uses Phillips Ballast. The 6 bulb fixtures are $130 each (I have 3 of em) they are rated at 336 watts (includes ballast)
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damn, i don't have four foot of length in my grow.. i'd love to try something like those though..
 
skinnysmoke

skinnysmoke

Well-Known Member
RM3 said:
My Tanning Booth uses Oracle High Bays, nothing like the crap you see in hydro/grow stores. Very High Quality and uses Phillips Ballast. The 6 bulb fixtures are $130 each (I have 3 of em) they are rated at 336 watts (includes ballast)
Click to expand...
Now I'm rethinking this fixture I posted in your Light??? thread http://www.ebay.com/itm/T5-Grow-Light-2ft-6Lamps-DL826S-Fluorescent-HO-Hydroponic-Bloom-Veg-DaisyChain-/221549706510?pt=US_Hydroponics&hash=item3395643d0e

I liked that it is small 2ft long less than 14in. wide with 6 fixtures, but now I'm worried about the ballast made by company called Ballastwise. I looked for reviews but cant find many :-? on whether to give a try or not. Company offers 1y warranty and has and 100% positive feedback. Gonna have to research more now.

Thanks for all the info and any feedback you could give about the ballast and company would be greatly appreciated:clap:

I think what @ racerboy71 has found may work for me, Thanks bro good find!!
 
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