Uvb?

Gastanker

Gastanker

Well-Known Member
marlfox117 said:
From what I have read and from my experience using the 10.0 UVB bulbs, it is only beneficial to have them on in your room for the last half hour or so of your light cycle to increase resin production in flowering and to aid in nutrient uptake in veg, I have only used them in Flower cycle before personally. I have heard that it will break resin down quickly and reduce overall resin if it is left on for too long.

I dont remember specific sites, but overall thats what I heard from multiple sources.
If anyone has proof of its benefits over long hours of use, I would love to hear it.
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Really don't mean to be offensive but UV baking the trichs is just sillyness. Trichs have two main reasons - to keep insects away and to shield the seeds from UV rays. The more UV the more trichs you'll have and the more potent (higher THC content) the trichs will be - THC and the secondary cannabinoids are actually synthesized utilizing the high energy levels of UV rays. The 10.0 UV bulbs are made to simulate dessert UV levels at 10-20" from the bulb. This is similar to the UV radiation received in high altitude locations where marijuana tends to grow best - Northern California mountains (emerald triangle), Colorado, most of South America, Afghanistan... You would never just receive UV for part of the day nor will all your plants receive anywhere close to natural UV levels unless you run absurd amounts of UV bulbs very close to your plants (like me :) ). Or if you grew in a tanning bed... someone should try that.
 
abecsta

abecsta

Active Member
sweet
also since i know someone else growing the same strain if i set up a uvb bulb i can compare who has the stickiest bud when we have both finished
and of course share the results :)

any one got a spare tanning bed just open her up on her side and put a 600w at the top
 
Brick Top

Brick Top

New Member
Originally Posted by Brick Top
I'd go with one or more of the self ballasted ones from this site.

http://www.reptileuv.com/megaray-sb-...d-uvb-lamp.php
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Gastanker said:
I believe the 23w UV CFLs have just as much UV or more than that 100w incandescent. That things throws off some mean heat as well in comparison.
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Is a mercury vapor light actually an incandescent light bulb, as you called it? Their 100 watt SB Par-38 Narrow Flood Lamp has been shown in tests to produce similar amounts of UVB to natural sunlight. Let's see your 23-watt CFLs match that.

You can purchase up to a 275 watt one, or if you have a zoo or are a qualified herpetologist or if you have UVB meter you can purchase their 160-watt one that puts out an incredible amount of UVB light.

The Mega-Ray is actually the highest quality source of UVB lighting you can find. That is why I suggested it. One would do WAY more than those 23-watt CFLs you mentioned.
 
Gastanker

Gastanker

Well-Known Member
Brick Top said:


Is a mercury vapor light actually an incandescent light bulb? Their 100 watt SB Par-38 Narrow Flood Lamp which has been shown in tests to produce similar amounts of UVB to natural sunlight. You can purchase up to a 275 watt one, or if you have a zoo or are a qualified herpetologist or if you have UVB meter you can purchase their 160-watt one that puts out an incredible amount of UVB light.

The Mega-Ray is actually the highest quality source of UVB lighting you can find. That is why I suggested it. One would do WAY more than those 23-watt CFLs you mentioned.
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I'm actually a reptile breeder and have never heard of those - I breed the smaller guys though. Both the CFL and flood light claim to be rated equally when it comes to uW/cm2 at 20". I personally do not have a UV meter though so who knows what the real numbers are.

I'm thinking that with the heat the mercury vapor lamp throws off and the high price you still would be better off with the CFLs. Hard to argue that you are going to get more UV with better coverage with one 100w mercury vapor than 4 of the equally rated CFLs. $45 per 100w MV and $10 per CFL.

My aunt is in charge of the herpetology department of a major Zoo. I should see if she can order me one of the big boys to play with - the 18" tubes I use are a bit of a joke when you have the CFLs and the MV that throw a bit further. I should probably get a UV meter first though...

/e do UV meters differentiate between UVA and UVB?
 
abecsta

abecsta

Active Member
nice link so you got any [FONT=Verdana, Arial, Helvetica, sans-serif]of the R-Zilla Desert Series 50 T8 tubes laying around
[/FONT]
 
stelthy

stelthy

Well-Known Member
Gastanker said:
This is what you want:



The numbers let you know how much UV there is. 10.0 is the highest and what you want.

I run 8 10.0 tubes which work great but the CFLs throw farther and are cheaper per watt. You should be able to find these online for $10.



UV up top.

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I'd love to have this room...Wow !! ...How long (time & days) do you run this many UV-B's at this distance from your ladies ??

Do you run them whilst your normal lighting is on, before, during or after (Night time) ??

I plan to add UV-B's to my cab but unsure as to how many UV-B lamps I will need (2X heavy feeding DWC under 400W MH/HPS) Cab size Aprox. (7' X 2' x 4') Max plant height: 38" or cab be SCROG'd @ 12" -14"

I'd be very interested to hear reply's I have REP! at the ready :) - STELTHY :leaf:
 
Gastanker

Gastanker

Well-Known Member
stelthy said:
I'd love to have this room...Wow !! ...How long (time & days) do you run this many UV-B's at this distance from your ladies ??

Do you run them whilst your normal lighting is on, before, during or after (Night time) ??

I plan to add UV-B's to my cab but unsure as to how many UV-B lamps I will need (2X heavy feeding DWC under 400W MH/HPS) Cab size Aprox. (7' X 2' x 4') Max plant height: 38" or cab be SCROG'd @ 12" -14"

I'd be very interested to hear reply's I have REP! at the ready :) - STELTHY :leaf:
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Thanks. I run my UV at all times while my lights are on and my plants are flowering.

This is the UV received during the day when it is sunny somewhere in Kentucky
7am: 12 microwatts/cm2
8am: 74 microwatts/cm2
9am: 142 microwatts/cm2
10am: 192 microwatts/cm2
11am: 233 microwatts/cm2
12pm: 256 microwatts/cm2
1pm: 269 microwatts/cm2
2pm: 262 microwatts/cm2
3pm: 239 microwatts/cm2
4pm: 187 microwatts/cm2
5pm: 131 microwatts/cm2
6pm: 61 microwatts/cm2

Here is the UV emitted by one particular UV CFL -


How many bulbs you need really depends on how much UV you want and how you place the bulbs. To average 180 (the average of above) you would need a bulb around every 18" about 6" from the canopy. Or one just one of these if you can find the US version - http://www.reptileuv.com/megaray-sb-160-watt-self-ballasted-flood-zoo-lamp.php
 
meharmon

meharmon

Member
Thanks for the thread... That video was awesome. I learn more everyday (thanks!) and now have to figure out how to toss in some UV CFL bulbs on top of HPS, Induction, and LED. I think the induction actually puts out some UV too, and the LED panel has a UV diode, which may explain why the last crop looked so great after swapping HPS for Induction/LED in bloom--- catching a side glance at a leaf makes it look exactly like powdery mildew its so white and shiny. And GASTANKER, I think you should commercialize that fabulous setup-- I'd buy it!
 
O

oOBe RyeOo

Active Member
Sorry about the pic quality, but in a space like this, if I ran a uv bulb 12/12 along with the hps I would be fine, no burning? AWESOME! I plan on buying an 18in or a cfl tomorrow. Haven't yet decided.

CIMG0243.jpg
 
Gastanker

Gastanker

Well-Known Member
meharmon said:
Thanks for the thread... That video was awesome. I learn more everyday (thanks!) and now have to figure out how to toss in some UV CFL bulbs on top of HPS, Induction, and LED. I think the induction actually puts out some UV too, and the LED panel has a UV diode, which may explain why the last crop looked so great after swapping HPS for Induction/LED in bloom--- catching a side glance at a leaf makes it look exactly like powdery mildew its so white and shiny. And GASTANKER, I think you should commercialize that fabulous setup-- I'd buy it!
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You think? I priced it out and the complete set-up would cost around $700 to put together including the UV bulbs, soil, nutes, and containers as long as I got the same deal on the side lighting units. If I were to purchase directly that should be considerably lower but I'm still not sure it would be low enough to catch peoples attention. What would you pay for a set-up like that? $1k? $800? $500? I have the price list along with sources somewhere on my xray thread if you want to build one yourself :)

/e just looked it up and if I didn't get the same deal on the side units it would be a bit more expensive. I guess those cost a grand apiece new.

oOBe RyeOo said:
Sorry about the pic quality, but in a space like this, if I ran a uv bulb 12/12 along with the hps I would be fine, no burning? AWESOME! I plan on buying an 18in or a cfl tomorrow. Haven't yet decided.
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If this page is accurate I would try and get a ZooMed Reptisun 10.0. This particular bulb puts out a somewhat unhealthy UV spectrum what isn't all that similar to nature but is up to 7x as intense in the low wavelength UV which is the higher energy UV. You should be fine with just one of these in that small enclosure. http://www.uvguide.co.uk/phototherapyphosphor-tests.htm#totalUVB
 
abecsta

abecsta

Active Member
You think? I priced it out and the complete set-up would cost around $700 to put together including the UV bulbs, soil, nutes, and containers as long as I got the same deal on the side lighting units. If I were to purchase directly that should be considerably lower but I'm still not sure it would be low enough to catch peoples attention. What would you pay for a set-up like that? $1k? $800? $500? I have the price list along with sources somewhere on my xray thread if you want to build one yourself


/e just looked it up and if I didn't get the same deal on the side units it would be a bit more expensive. I guess those cost a grand apiece new.
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1000usd seems alright for your set up as long as the hps there is at least 600w i would buy it
 
stelthy

stelthy

Well-Known Member
Gastanker said:
Thanks. I run my UV at all times while my lights are on and my plants are flowering.

This is the UV received during the day when it is sunny somewhere in Kentucky
7am: 12 microwatts/cm2
8am: 74 microwatts/cm2
9am: 142 microwatts/cm2
10am: 192 microwatts/cm2
11am: 233 microwatts/cm2
12pm: 256 microwatts/cm2
1pm: 269 microwatts/cm2
2pm: 262 microwatts/cm2
3pm: 239 microwatts/cm2
4pm: 187 microwatts/cm2
5pm: 131 microwatts/cm2
6pm: 61 microwatts/cm2

Here is the UV emitted by one particular UV CFL -


How many bulbs you need really depends on how much UV you want and how you place the bulbs. To average 180 (the average of above) you would need a bulb around every 18" about 6" from the canopy. Or one just one of these if you can find the US version - http://www.reptileuv.com/megaray-sb-160-watt-self-ballasted-flood-zoo-lamp.php
Click to expand...



How many of which Wattage, Type (CFL/FLUORESCENT) do you recommend for my Cab? I wanted to do this for my grow just Harvested... But I want to do this asap now that I have finished, ready for next time :) - STELTHY :leaf:
 
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