10.0 Uvb Light

hoho so did leaving your uv light off did the buds grow back or was they still growing sinle pistils like mine thanks m8 i will get my light higher

weedyoo said:

i dont know what plants they did tests on besides the ones they takled about.
but were these plants that grow better at the equater where their is high uvb. good read thanks rep

Click to expand...

Equatorial plants don't necessarily get more UV. Remember, they are getting mostly 12 hours of daylight year round so I'm not sure how photoperiodic plants like mj do there. It looks like alternate mechanism for photoperiodic has been proposed.

Now moutain ranges where there is less atmosphere between the sun and the plant definitely are getting higher UVB levels than sea level. Hindu Kush might be a good example or just about any of the strains grown in the Himalayas. This also makes me think the the outdoor growers in Colorado, Wyoming, etc. might have advantage over sea level growers. Could this also be part of the reason Humboldt County has such good weed? The inland part has elevations over 3,000 ft asl.

moodster said:

hoho so did leaving your uv light off did the buds grow back or was they still growing sinle pistils like mine thanks m8 i will get my light higher

Click to expand...

u messed up on an important word but the pistols did start to grow normal after i turned off the light i think it was heat related..i will take 4th week pics tomorrow for this little contest i started a while back,u guys can guess if u want...i'll try to get a good comparison pic but i can't promise anything cuz i don't now how to take good pics..



https://www.rollitup.org/general-marijuana-growing/144233-guess-right-win-50-bucks.html

mindphuk said:

Equatorial plants don't necessarily get more UV. Remember, they are getting mostly 12 hours of daylight year round so I'm not sure how photoperiodic plants like mj do there. It looks like alternate mechanism for photoperiodic has been proposed.

Now moutain ranges where there is less atmosphere between the sun and the plant definitely are getting higher UVB levels than sea level. Hindu Kush might be a good example or just about any of the strains grown in the Himalayas. This also makes me think the the outdoor growers in Colorado, Wyoming, etc. might have advantage over sea level growers. Could this also be part of the reason Humboldt County has such good weed? The inland part has elevations over 3,000 ft asl.

Click to expand...

just from what i have seen i am going to keep using it.

any time you grow at higher elev its better i think one of the reasons is the quick chang in fall.

HOHO said:

here's a little more info...
http://www.uvguide.co.uk/lightingsurveyintro.htm

Click to expand...

Great find HOHO - that's the site I linked to earlier, but I didn't realize they had so much information on there, they have a whole bunch of distribution patterns for the bulbs with intensities and distances, REALLY useful

Mercury vapors FLOODS = good for buds that are all near canopy or clustered. sunlight levels around 3 - 6" from burnt in bulb

Mercury vapor narrow beams / spot / focused = same as above but probably only worth looking at if you already have a light mover. really high intensity but only in one foot sized patch. could improve distribution by hanging a cone or V shape in front of the bulb, pointing towards it. sunlight level around 9" from burnt in bulb

Fluoros = good if you have buds all over the place, need quite a few to get good intensity (4 or more vertically in 1.2m tent?). barely reaches sunlight intensity even up close (3" or less)

CFLs = good if you have fewer budding sites (they're tighter together) and you can hang the bulbs near them, produce a diffused illumination more concentrated around the bulb than fluoros but not as intense as vapors (less than fluoros but still a few). for a 23w 7% CFL you'll get sunlight UVB at around 3" around from 20w 8.0 bulb

With more dispersed buds, rotating the plants regularly might still be a good idea to make sure the UVB hits them all over

How about fixing the vapors to an oscillating fan or doing the same with the fan on a light mover, that'd produce some excellent distribution. And since the bulbs don't have filaments, it shouldn't damage them. Could remove the fan blades if it's an issue.

NOTEWORTHY BULBS = We've mainly looked at the Zoo Megaray. This thing pours out UV at sunlight levels up to a few feet away at first, but it's ridiculously focused (which is why the readings are so high directly in front of it) - the sunlight cone is only ~ 6" across! The cone is very sharp, not good. The Osram 300w Ultra-Vitalux is a similar bulb and produces sunlight UVB at around two foot, but in a softer cone. It's also about half the price (or less) of the Megaray

Good info Peach, thats what I was looking for. Will start with 1 in each light 4" from buds. I'll be posting and pic'n, if I see a major change in a few days. Thanks for all the info guys.

techgrower said:

Good info Peach, thats what I was looking for. Will start with 1 in each light 4" from buds. I'll be posting and pic'n, if I see a major change in a few days. Thanks for all the info guys.

Click to expand...

No problem.

I was interested to see the Osram Ultra-Vitalux was developed for sun tanning.

Now wondering if maybe sunbed fluoros might be better than reptile fluoros. I doubt they'll emit more UVB per watt, but they come in wattages up to five times the reptile fluoro's and in 6ft lengths - just the right size to span the height of a tent

And, you can get suntanning fluoros with or without a reflector, so the reflector ones would work good in corners and a none reflector in the center

Another possibility are bulbs designed for tanning only your face (no idea why you'd do that, my face is always more tanned than the rest of me).

These are high power (400w) and radiate light in every direction.

i think your on to some thing with the tannning bulbs they can burn your ass in a quick minute

HOHO said:

i think your on to some thing with the tannning bulbs they can burn your ass in a quick minute

Click to expand...

Seems sunbed fluoros emit ~5% UVB +/- 3%, so picking the right one would be important.

UVB is better at producing a tan apparently.

On to brand name searching.....

Going today at lunch to get 2, 2" floros for my T-5 gonna try at least, gonna swap out some 6500k bulbs. increase 3000k and uvb should be ok in 4-5th week flower. thanks peach.

Check this out;

http://www.lighting.philips.com/

Catalog in the top left, then select region lamps / gear.

They have 100w UVB fluoro's under medical as well as the face tanning 400w HID under suntanning.

The 100W medical fluoros output around 15w of diffused UVB - they're looking pricey on the first check though, so it may still be worth investigating sunbed tubes.

I really need something that will fit my light now, so I will check out the reptile ones. I'm sure they dont make a 2" tanning bed bulb, unless its for midgets.LOL.

I'm in the club, hung a 36" 30W 8.0 this afternoon (no 10.0s in our pet store). I'm going to make a rectangle of UVb tubes around my main light, 2 x 30W (36") and 2 x 20W (24").

One problem I'm having is keeping the UVb light fixture out of the main light's (HPS) light shadow while getting the UVb light fixture close enough to the canopy.

.

been usin uvb for the 1st 4 weeks, 150w tht is the same kind for reptiles, took it off and could see discolor-ish, lighter green....

would recomend


BTW!!! Some of the highest natural UVB and UVA rays are in Africa near, south Egypt, and in the middle east, Kush Mountain rang anbody? AFgani?

This light looks promising:

http://www.reptileuv.com/megaray-eb-60-watt-flood-zoo-lamp-kit.php

info:
http://www.reptileuvinfo.com/html/mega-ray-narrow-flood-report.htm

ps

I stole the above information from forum member NortherLights. Thank you NL.

.

I'd like to see a light distribution chart for the floros tubes, here's one for a 60W bulb. Scroll down for charts and pictures with charts and other kinds of charts.

http://www.reptileuvinfo.com/html/mega-ray-narrow-flood-report.htm

.

Hobbes said:

I'd like to see a light distribution chart for the floros tubes, here's one for a 60W bulb. Scroll down for charts and pictures with charts and other kinds of charts.

http://www.reptileuvinfo.com/html/mega-ray-narrow-flood-report.htm

.

Click to expand...

well the one problem I foresee with these lights is they put out a lot of heat. so if you have that on top of HIDs, you better have amazing ventilation.

Hobbes said:

This light looks promising:

http://www.reptileuv.com/megaray-eb-60-watt-flood-zoo-lamp-kit.php

Click to expand...

We've been discussing that lamp a few pages back.

It's good, but the UVB it puts out is in an extremely focused cone underneath the bulb; which is why it has such a high rating (most of the light is in one place). It's a narrow / spot bulb. You're need a light mover or you'd just be cooking one plant with 99% of the UVB (the sunlight cone is around a foot wide, or less, even a few feet from the bulb). It's designed to produce such a small area of illumination because reptiles often have a favorite stone they go and mong out on while they bask.

There are others that put out a similar amount but with better distribution and that cost about half as much (Osram Ultra-Vitalux). This is was one of the first high power tanning bulbs and is designed to spread the light for an even tan. Which is what you want for illuminating a grow.

Hobbes said:

I'd like to see a light distribution chart for the floros tubes

Click to expand...

Distribution from the fluoro's is excellent, which is why they usually have lower quote outputs (the light is very spread out).

We've been considering sun tanning tubes / medical UVB tubes as they're essentially reptile fluoros designed to run at five or ten times the wattage for a similar bulb cost.

The competition is currently between high power mercury vapor tanning bulbs (Osram Ultra-Vitalux or similar) and the tanning / medical fluoros (reptile UVBs are a lower power, more expensive version of these).

Peach what distance to the canopy do you recommend for floros? Here's some calculations a lot of us will be contimplating:

I'm running a 4.5' x 4.5' grow room lined with Reflexsomethingorother (97% relextion). I'm placing UVb floros in a rectangle around my HID light, 2 x 3' + 2 x 2' for 100W total. The literature for the reptile bulbs say that they're good(?) up to 20", the closest to the canopy that I can get them without blocking the HID's light is 12", unless I push them against the walls where their light won't reach the middle of the garden.

Question:
Is 12" close enough to provide the proper UVb to the garden?

.

Does this look correct?

Garden = 4.5' x 4.5' = 20 ft sq
Need .23~W UVb per sq ft = .23~ W UVb x 20.25 ft sq = 4.78W UVb needed for 4.5' x 4.5' garden.
Lamp 10.0 = 4.78W UVb / 10% UVb = 40.78W reptile lamp needed

But at what distance?

.

Kant: "one problem I foresee with these lights is they put out a lot of heat. so if you have that on top of HIDs, you better have amazing ventilation."

It suprised me that these are very low heat lamps, especially the floro tubes. There are even warnings in their advertisement that they don't put out much heat and suplemental heating must be used for reptiles.

"Provides an effective UVB source without providing excess heat."

http://www.petsmart.com/product/index.jsp?productId=2752589

.

and where would one find these medical fluoros? without looking completely suspicious...