Late flower uvb

http://www.beardeddragon.org/bjive/v...?f=34&t=167011

ouldnt find the actual test just a ton of people reffering to them seem they are supposed to have fixed them in the last couople months i remember here recently they where selling off all the old stock and i almost got sucked in to buying a ton of the bulbs because they where on sale at like 1/3 of the price!

anyways these are the terms i google there are UVB test results up for the new zilla bulbs and they are lookin pretty good.
"zilla t5 UVB meter test" "zilla UVB problems"
i was pretty sure that zilla didnt make a 10.0 but they may have in the past.

Anyone have any input on putting a tanning bed light in? They definitely have the UVB's

yeah but its in the wrong part of the UVB spectrum 290-200 nm we are looking for 275-285nm reptiles are around 280nm which is perfect for us.

but dont get me wrong they would still work but im not dropping the cash for those products they are asking too too much now if i got one for free thats another story.

Originally Posted by yesum

I have a uvb bulb and due to space restrictions have not used it during flower. I need at least 5 inches of space between the bulb and the buds and I am using the bulb vertically. I am in the last week or 2 of flower and am going to take half the plants out of the tent and give those left in it an hour of uvb and then switch the plants and do it again.

This is a hassle and can only do it for a few days. I am wondering if it will have any effect. I do not need more trichs as there are more than enough on all plants. I was hoping the thc in the trichs might become activated a bit by the uvb, even though it will be just a few hours during the plants life.

I have a uvb meter and have figured out how much the plants can take and the lower limits of uvb at the farthest distances, so no worries there.

**you would probably have better results if you started as soon as you flipped 12/12, but the THC+ on your flowers will still have some sort of (reaction)..

**you can also use glass to lower/filter the UVB levels instead of distance --just in-case space is an issue.

cheers

finally sum good input thanks mr wizzard
i did not think of that
a piece of glass or cool tube will difuse the rays

Originally Posted by Dwezelitsame

finally sum good input thanks mr wizzard
i did not think of that
a piece of glass or cool tube will difuse the rays

*Sup Dwezel

**here's a little cut&paste 'glass' explanation off google;

Now about the glass. Glass is transparent because it lets all the colors go true it but what we can not see is that it acts as a filter for UV light. Most of UV radiation is stopped by glass & this is why you will not get sunburns behind a glass.
The glass simply filters out the UV radiation that is responsible for the sunburns & protect your skins from these energetic & somewhat harmful radiation. Sunblock lotion works exactly the same way, they simply filter out UV light.

Answered by: Gilles Lalancette, M.S., Physicist, Dorval, Québec, Canada


You can, actually; it depends on the glass.
We know that electrons in any molecule can only absorb radiation at certain frequencies. It turns out that the electrons attached to molecules in typical glass (like the glass in your windows at home, or the safety glass in car windows) can absorb radiation at UV wavelengths, but not at visible light wavelengths – therefore, visible light passes through glass as if it weren’t there, but UV radiation is absorbed. It depends on the glass exactly how much UV radiation is absorbed, though. UVB rays are shorter than UVA rays -- that means they're more energetic, and they're usually the ones responsible for a sunburn. UVA rays are closer to the visible part of the spectrum, so it makes sense that some UVA radiation can make it through the glass. There is a difference of opinion on exactly how much damage UVA radiation does to you, but we do know that since it has a longer wavelength, it goes deeper into your skin. While UVB rays seem to be the primary culprit in skin cancer, UVA rays have been implicated as well. And according to NASA, most tanning salons use UVA radiation, probably because it burns less but still causes the pigmentation in skin that manifests as a tan.
The upshot, though, is that glass should shield you from most of the harmful UV radiation running around out there.

Answered by: Rebekah Cowdrey, Physics Undergrad Student, U. St. Thomas, St. Paul

what about the sunmaster 1000k 1000watt. i was instrested in using a uv bulb the last two weeks of myy grow. is it really worth the money? what will it really do to my buds?

Originally Posted by jojodancer10

what about the sunmaster 1000k 1000watt. i was instrested in using a uv bulb the last two weeks of myy grow. is it really worth the money? what will it really do to my buds?

the above answer is the answer you need the glass on that bulb will only allow it to emit some UVA but no UVB.