Anyone used UV-B and/or recommend it?

[guest]

Hey,

I've read all the relevent threads regarding UV-B and I was curious if anyone has acutally used it or know someone who has, and if so...

[1] what type lamp did you use?
[2] where did you get your lamp from (eg. manufacturer)?
[3] what distance from the canopy did you use?
[4] how long did you run the lamp each day?
[5] did you use it in veg and flower?
[5] any detrimental effects?

I've read 270-300nm is the sweet spot, is this accurate?

--> Did you see an increase in the amount of trichomes? (I've read that while UV-B may or may not increase the amount of trichomes it may increase the amount/percent of THC within trichomes.)

--> Was the cannabis 'stonier'?

[The Cannarchist]

IPcpt3Be28o

[The Cannarchist]

http://www.uvguide.co.uk/zoolamps.htm

[The Cannarchist]

Treat your plants as though they were you trying to get a suntan......

Start with 5 mins a day at the Noon time of the lights.

Increase slowly and back off if you see "Sun" burn (UVb burn)

Use evey day from the first buds until harvest.

Run the bulb on it's own seperate circuit.

DO NOT BE IN THE ROOM WHEN THE BULB IS ON,AND NEVER LOOK INTO THE LIGHT.

[guest]

Hey buddy :D

Thanks for the info!

How far should I keep the light from the canopy (your second link says min of 36 inches for reptiles)? How many lights would I need to cover a 4x3 garden?...or should I just hang the light in different locations above the canopy each day?

I read the info in your second link and I'm a bit confused as to which bulb is superior (I think the Osram is the one)? The link did mention that Mega-Ray will only sell to zoo's, etc...will they sell to poor little ol' me?

Here's the Osram for $80.00 http://www.bulborama.com/store/cart.php?m=product_detail&p=711 but it's 230 volt.

Here is the Mega-Ray 275watt for $52.00 http://www.reptileuv.com/megaray-sb-275-watt-self-ballasted-flood-uvb-lamp.php?cn=y which is also 230v. Although your second link tested with a 60 watter, not a 275 watter.

Do you have a better link then those I posted for purchasing a bulb?

How could I run one of these? You mentioned I would need a separate circuit? Guess I can't just plug er' in...I would need to run a new outlet for 230v from my circuit breaker box? (I live in America n our homes have 120v sockets)

thanks

[The Cannarchist]

http://www.reptileuv.com/megaray-sb-100-watt-self-ballasted-flood-uvb-lamp.php

This is the one you want Gojo.available in the US of A.

Put 4 hooks in each quadrant of the garden and move the bulb around each day.

Just run a circuit from an outlet in the room with a switch on the outside so you can turn it on and off without having to go inside.

Run the bulb about 2 ft from the tops but monitor the leaf underneath to check that the heat from the bulb will not fry the plants.

Works best on Equatorial sativas.

[guest]

Hey cannarchist

Man, you are a wealth of information!

My newest garden (4x3sq') has a 600watt P.L. with a Hortilux Super HPS (88,000 lumens), a 400watt MH P.L. with a Hortilux Blue and now a fancy new UVB bulb too...thanks to your help. Should cover all important spectrums and have plenty of intensity to boot!

Ordering my new UVB bulb very soon, thanks man

[Green Supreme]

So I was sitting with Marijuanaman yesterday discussing UV-B. It seems that Marijuanaman has laid down a map of the most intense UV-B on the planet and it turns out all the pot "Sweet Spots" are the areas of highest concentration. This being said I think more research need to be done with this type of light indoors. Peace GS

[c-ray]

here's some uv maps from http://jwocky.gsfc.nasa.gov/ery_uv/ery_uv1.html

first map is from summer solstice 2005
(check out the pink blotch around SE Asia)

second map is from winter solstice 2004

[c-ray]

current uv maps -> http://www.accuweather.com/world-maps.asp?partner=accuweather&type=uvi

another lamp comparison -> http://www.carolinapetsupply.com/uvb_output_of_bulbs.htm

uv meter -> http://www.solarmeter.com/model62.html

[Green Supreme]

Hey C-ray how come no one uses these indoors? I mean I know they are bad for you, but you wouldn't have them on while you are in there.
Peace GS

[c-ray]

from the same link cannarchist posted above -> http://www.reptileuv.com/megaray-eb-60-watt-flood-uvb-lamp-kit.php

the 60w external ballasted Mega-ray puts out similar amounts of uv as the 100w self-ballasted Mega-ray, but it is low heat while the 100w produces heat...good to know if heat is a consideration

[c-ray]

Hey C-ray how come no one uses these indoors? I mean I know they are bad for you, but you wouldn't have them on while you are in there.
Peace GS

these reptile bulbs produce 5-10% uvb, the same as full sun in the tropics, so they should be safe to sit under for a few minutes anyways (sunburns happen!)

there are cheap fluoro bulbs that are putting out more than 10% uvb and there are medicinal bulbs that put out way more, now those would be unsafe for human exposure

now the ? why are they not found in more growrooms? good question maybe when jorge cervantes and high times endorses them we will see their popularity skyrocket

I am going to pick up at least one and see if it does anything

[c-ray]

lest we forget about the equator here are some uv maps from spring and fall equinoxes 2005

[Green Supreme]

LOL thats what Marijuanaman said. Peace GS

[c-ray]

http://www.tanninglamps4less.com/ligsoureqsun.html

8.5% uvb 100w bulbs $14.49 each...just need an appropriate HO ballast (like this one http://www.tanninglamps4less.com/sunhorse.html which drives up to 4 of these bulbs)


better yet here's a whole list of tanning bulbs with their uvb % -> http://www.saverpluslighting.com/bulbs/tanning-lamps-bulbs.php (canadian website)

[Green Supreme]

You go C Monsta. Peace GS

[trichome pharm]

Hmmm, very interesting gentlemen....

What kind of setup would you guys recommend to properly cover 6 4x8 Tables with 12 000 w adjust a wings?

Very curious to find out!!!

thks
tp

[The Cannarchist]

Go for the no heat in excess of 8% Uv-b bulbs.

Get a Uv meter and get them to produce over 25 u of UV-b per sq ft

[trichome pharm]

Thanks for the reply the cannarchist.
I will investigate further on the coverage of these bulbs.
Do you think it is still worth it with heavy indicas and ganeys?
cheers

[The Cannarchist]

They were naturally designed

[Nirrity]

[QUOTE]Influence of PAR and UV-A in Determining Plant Sensitivity and Photomorphogenic Responses to UV-B Radiation
Photochemistry and Photobiology, Apr 2004 by Krizek, Donald T

ABSTRACT
The role of photosynthetically active radiation (400-700 nm) (PAR) in modifying plant sensitivity and photomorphogenic responses to ultraviolet-B (280-320 nm) (UV-B) radiation has been examined by a number of investigators, but few studies have been conducted on ultraviolet-A (320-400 nm) (UV-A), UV-B and PAR interactions. High ratios of PAR-UV-B and UV-A-UV-B have been found to be important in ameliorating UV-B damage in both terrestrial and aquatic plants. Growth chamber and greenhouse studies conducted at low PAR, low UV-A and high UV-B often show exaggerated UV-B damage. Spectral balance of PAR, UV-A and UV-B has also been shown to be important in determining plant sensitivity in field studies. In general, one observes a reduction in total biomass and plant height with decreasing PAR and increasing UV-B. The protective effects of high PAR against elevated UV-B may also be indirect, by increasing leaf thickness and the concentration of flavonoids and other phenolic compounds known to be important in UV screening. The quality of PAR is also important, with blue light, together with UV-A radiation, playing a key role in photorepair of DNA lesions. Further studies are needed to determine the interactions of UV-A, UV-B and PAR.
Abbreviations: BSWF, biological spectral weighting function; CA, cellulose acetate; CHS, chalcone synthase; CPD, cyclobulane pyrimidine dimer; CRY, cryptochrome; HPS/DX, high-pressure sodium/deluxe; MH, metal halide; PAR, photosynthetically active radiation (400-700 nm); PSII, Photosystem II; RAF, radiation amplification factor; UV-A, ultraviolet-A (320-400 nm); UV-B, ultraviolet-B (280-320 nm); 6-4 PP, pyrimidine (6-4) pyrimidone dimers; 8-oxodGuo, 8-oxo-7,8-dihydro-2'-deoxyguanosine.

INTRODUCTION

Since the early 1970s there have been intensive efforts to assess the biological impact of stratospheric ozone depletion caused by chlorofluorocarbons and other anthropogenic sources. Comprehensive reviews have been written on the effects of ambient and supplemental ultraviolet-B (280-320 nm) (UV-B) radiation on terrestrial plants (1-16). Several excellent reviews have also been written on the impact of solar UV radiation on aquatic organisms (12, 16-18).
Increases in biologically effective UV radiation due to decreases in total ozone have been observed in Antarctica during the formation of the ozone hole as well as in the Northern Hemisphere (19). Recent changes in surface UV solar radiation and stratospheric ozone have also been reported at a high Arctic site, although it is still too early to make trend estimates. Current levels of stratospheric ozone are at the lowest point since measurements were first taken in the 1970s; global terrestrial UV-B radiation levels range between 0 and 12 kJ m^sup -2^ day^sup -1^, with regions near the Equator and midlatitudes receiving higher doses (15).
Research on UV-B effects on crop plants has been conducted largely with species from temperate latitudes (see reviews in Krupa et al. [4], Day [9], Caldwell et al. [13], Flint et al. [14], Kakani et al. [15] and Corlett et al. [20]). If sensitive cultivars are avoided, crop yield of these species may not be greatly reduced (7). Much less is known, however, about crops and ecosystems in tropical regions in areas of intense solar UV-B radiation (21,22).
The fact that there are many indirect effects of UV-B radiation as well as numerous interactions with other environmental factors (4,10,12-15,23-26) makes UV-B research highly complex. Results from short-term studies on UV effects cannot necessarily be extrapolated to long-term assessments. In contrast to studies in other fields of environmental research, such as air pollution (4), the database of realistic and ecologically relevant UV-B studies is extremely limited, and the interpretation of published data on UV-B experiments is often equivocal (7,13,15).
The role of photosynthetically active radiation (400-700 nm) (PAR) in modifying plant sensitivity and photomorphogenic responses to UV-B radiation has been examined by a number of investigators (27-31), but few studies have been conducted on ultraviolet-A (320-400 nm) (UV-A), UV-B and PAR interactions (32-34). To ameliorate the effects of elevated UV-B radiation, it is important to have a good understanding of how these various wavelengths act in concert with one another to influence plant growth and development.
The objective of this article is to review recent literature on the interactive effects of UV-A, UV-B and PAR in influencing plant sensitivity to UV-B radiation and photosynthetic responses; discuss the role of UV-A and blue wavelengths in repairing DNA damage in terrestrial and aquatic plants; review current knowledge of UV photoreceptors in photomorphogenesis; and describe natural UV-B defense mechanisms.

COMPARISON OF GREENHOUSE, GROWTH CHAMBER AND FIELD STUDIES

Numerous UV-B enhancement studies on terrestrial plants have been conducted under laboratory, growth chamber, greenhouse and field conditions (see reviews in Ballare et al. [8], Day [9], Searles [10], Bjorn [11], Day and Neale [12], Caldwell et al. [13], Flint et al. [14], Kakani et al. [15] and Vincent and Roy [16]). Results from greenhouse or growth chamber studies and field studies on UV-B effects are often conflicting (14,21) or difficult to interpret, because of unrealistically high UV irradiation levels, inadequate levels of UV-A, low PAR or other technical difficulties (14,15,34-40). In general, one observes a reduction in total biomass and plant height with decreasing PAR and increasing UV-B.
Outdoor supplementation systems have increased in popularity during the past few years because they provide a method of study that creates only small alterations in the microclimate (2,15,39,40). However, they differ greatly in their methods of operation, equipment, UV-B exposure regime and experimental design (2,14,15,35, 37-39,41-43).
UV-B studies conducted on natural ecosystems in Hawaii indicate that species from high elevations, exposed to high levels of ambient UV-B, were generally more resistant to enhanced UV-B than corresponding plants grown at low elevations, when both groups of plants were grown in the greenhouse under supplemental UV-B (44).

PLANT RESPONSE TO AMBIENT SOLAR UV RADIATION

To avoid many of the problems inherent in UV enhancement experiments, there has been growing interest in the use of systems that exclude or attenuate the UV-B component of natural solar radiation (8,10,25,45-58). To date, relatively few species or cultivars have been investigated under UV-exclusion conditions. Thus, our knowledge of the effects of ambient solar UV-B and UV-A radiation is meager. The results of UV-exclusion studies indicate thai plants vary widely in their response to ambient UV-B (52,57). In some species (e.g. cucumber, mung bean, New Zealand spinach and "New Fire" lettuce) growth is inhibited by solar UV-B (48-51). In some species (e.g. tomato and others) growth is promoted (49,59), whereas in others (e.g. cotton, oats) it is unaffected (48,49).
Qualitative effects of solar UV-A radiation on higher plants have been reported (see Tezuka et al. [60] and references therein), but quantitative data are minimal. Recent UV-exclusion studies conducted at Beltsville, MD, on cucumber (49) and a red-pigmented lettuce (51) indicate that ambient UV-A greatly inhibits leaf enlargement, stem elongation and biomass production over and above that under ambient UV-B.
In conducting UV-exclusion studies, it is important to obtain measurements of UV-A, UV-B and PAR transmission through the filter materials. Measurements of total radiation or infrared radiation with a pyranometer above and below the filters should also be made because slight differences in transmission through different exclusion filters can cause serious confounding effects (14). Although cellulose acetate (CA) has been widely used in UV-B-exclusion studies, recent evidence indicates that CA toxicity (manifested as stunting and chlorosis in cucumber [Cucumis sativus L.]) may occur possibly as a result of outgassing of dibutyl phthalate, known to be used as a plasticizer in the manufacture of CA or some breakdown product (58). To avoid possible confounding effects from the use of CA (58,61) and to obtain maximum transmission of UV and PAR (8,9,12-14,61), it is preferable to use Aclar (polychlorotrifluoroethylene) or Teflon FEP (a copolymer of tetrafluoroethylene and hexafluoropropylene) in UV-exclusion studies. Other materials have also been used to alter the spectral cutoff (58).
One method of UV-B attenuation that has been used successfully is to construct an O^sub 3^-containing envelope of UV-transparent Plexiglas to reduce the amount of UV-B. These "O^sub 3^ cuvettes" have been placed over growth chambers outdoors in Portugal to simulate ambient and elevated UV-B conditions in Germany (47). This system is rather expensive, however, for most investigators and must be monitored for possible O^sub 3^ leaks.

GENOTYPE DIFFERENCES IN UV-B SENSITIVITY

Species and cultivars within these species may differ widely in their response to UV-B (62-64). Monocots appear to be generally more resistant to UV-B enhancement than dicots (50). Native species appear to be more resistant to elevated UV-B radiation than crop plants in terms of changes in biomass reduction, but both groups may show subtle changes in shoot elongation and leaf size. These morphological changes may have important consequences for natural ecosystems by altering the competitive balance in mixed communities, with more UV-B-resistant species replacing UV-sensitivc ones.

ROLE OF UV PHOTORECEPTORS IN PHOTOMORPHOGENESIS

The importance of UV radiation in photomorphogenesis has become increasingly recognized (65). In recent years it has become clear that plants have several UV photoreceptors and that UV exerts its action through the coaction of UV photoreceptors and photoreceptors in the visible region (65-70). It is generally believed that there are three main sensor pigments in higher plants: phytochrome (operating predominately in the red-far-red spectral range), cryptochrome (CRY1, operating in the blue-UV-A spectral range) and a UV-B photoreceptor with maximum action at 280 nm (and no action at wavelengths longer than 350 nm) (66).
Plants are thought to have at least two types of blue light receptors, CRY and phototropin (70). CRY are 70-80 kD flavoproteins that are similar in structure to DNA photolyase but lack photolyase activity (70). CRY act concurrently with phytochromes to mediate photomorphogenic responses such as inhibition of stem elongation, stimulation of leaf expansion, photoperiodic control of flowering, entrainment of the circadian clock and regulation of gene expression (70). They have been found throughout the plant kingdom. Phototropins mediate photomovement responses such as phototropism, chloroplast relocation and stomatal opening.
Numerous studies have been conducted to elucidate the mode of action among these three sensor pigments (66), and several model systems have been proposed (69). It is generally believed that these different photoreceptors, acting in some cases at different stages in plant development, work together to provide protection against damaging UV-B wavelengths (69).
Photophysiological, biochemical and genetic data indicate that plants contain a number of different blue-UV-B photoreceptors. However, molecular information on a blue-UV-A photoreceptor in plants is meager (70,71). The possibility that the chromophore could be a carotenoid has been considered (72) but has meager experimental support. Studies involving the use of Norflurazon (SAN 9789) and Difunon (EMD-IT-5914) to inhibit carotenoid biosynthesis also argue against this possibility.
Several workers have suggested that the UV-B photoreceptor is probably a protein with flavin or pterin chromophores (or both) (69,70,72,73). Pterins are thought to be a particularly strong candidate (69,70). Recent experiments indicate that there is a synergistic interaction among UV-B, UV-A and blue light signal transduction pathways (68-70), but there is only meager information published specifically on UV-B signal transduction (70).
Lin et al. (74) demonstrated that overexpression of CRY1 resulted in hypersensitivity to blue, UV-A and green light for the inhibition of hypocotyl elongation in Arahidopsis; transgenic plants overexpressing CRY1 showed increased anthocyanin accumulation in response to blue, UV-A and green light in a fluence-dependent manner. They concluded that CRY1 is a photoreceptor mediating blue light-dependent regulation of gene expression. Lin et al. (75) also found that expression of an Arabidopsis CRY gene in tobacco results in hypersensitivity to blue, UV-A and green light. Ninu et al. (76) reported that CRY1 controls tomato development in response to blue light.

INTERACTIVE EFFECTS OF UV-A, UV-B AND VISIBLE RADIATION

There are numerous reports on the separate effects of UV-A, UV-B and visible radiation on terrestrial plants, but relatively little has been published on the combined interactions of these wavelengths. One of the difficulties in drawing extrapolations from early UV-B studies in plant growth chambers to what might occur under field conditions is that the PAR levels obtained in these controlled-environment experiments using artificial sources (e.g. fluorescent and incandescent lamps) were generally quite low (14). Use of high-intensity discharge lamps (30,77,78) and other sources of high PAR should enable more meaningful UV-B growth chamber studies to be conducted.
The balance of irradiation in different wavebands (UV-B, UV-A and visible) has been shown to have a large bearing on plant sensitivity to changes in UV-B (21,27,29,32-34,78-82). Adamse and Britz (83) reported that ambient PAR (ca 1000-1600

[c-ray]

looks like ozone coverage is somewhat related to uv, check the blue zones
daily maps from http://es-ee.tor.ec.gc.ca/e/ozone/Curr_allmap_g.htm

current ozone coverage:
http://es-ee.tor.ec.gc.ca/ozone/images/graphs/gl/current.gif

[Nirrity]

Does anybody have experience compared the quality of highs of buds grown under unshielded MH and glass-shielded (say cooltube) MH?

[c-ray]

I think all hid bulbs now have uv coatings in the outer glass, are you talking about removing the outer glass?

haha I just noticed in the nasa charts above that the pink zones = 420 mw/m2...so here's a question, if I breed seeds indoors with 420 mw/m2 of uv and some mh lights in the mix will the indicas turn into sativas after a few generations??

[Nirrity]

Don't think so because indicas naturally grows with very high UVB, at least if speaking about ighlands, say Hindukush/Pamir region. I think it's possible that dry continental highland extremely low humidity inclement climat is amajor factor that contributes to indica main characteristics...

Yes almost all new MH (ceramic arc) have UV coatings but not all and in most cases not equally effective. Old quartz MH doesn't have UV shield, some modern DE (double-ended) MH have uv shield but not especially effective.

[c-ray]

do you know which brands do not have a uv coating?
I know an easy way to tell if they have a uv coating is to spend a 2+ hours in front of the bulbs... no tan or sunburn = uv coating...but I have tried this with eye hortilux, solarmax, sunmaster, ge and sylvania and have not burnt or tanned even after 4+ hours so they must have a good uv coating...maybe there are other bulbs that do not...I do remember though about 5 years ago it was easy to get a burn

you must be right about the indicas, which traditionally are coming from afganistan, pakistan, china, uzbekistan, nepal, etc area...so do you think we need uva as well as uvb? the report above says 400-700nm
I think also there is a difference in light spectrum between the equator and the poles that makes a plant more like an 'indica' or a 'sativa' but I am going to start a new thread to discuss this
thanks for the discussion this is good stuff

[Nirrity]

do you know which brands do not have a uv coating?
I know an easy way to tell if they have a uv coating is to spend a 2+ hours in front of the bulbs... no tan or sunburn = uv coating...but I have tried this with eye hortilux, solarmax, sunmaster, ge and sylvania and have not burnt or tanned even after 4+ hours so they must have a good uv coating...maybe there are other bulbs that do not...I do remember though about 5 years ago it was easy to get a burn

I have no experience myself, but some aquarium MH like USHIO or Aqualine Buschke seems have no uv shield

http://www.advancedaquarist.com/issues/nov2002/feature2.htm

http://www.advancedaquarist.com/issues/feb2004/feature1.htm

http://www.advancedaquarist.com/issues/aug2004/feature.htm

I agree it's pretty sad that almost every modern MH have uv coating, so we must figure ourselves which one to choose...

one more thing: osram catalogue has ACGIH UV rating - some lamps have over 200 hours to couse burn, but some only 11 minutes!

[Green Supreme]

I sorta found this link today. Peace GS

http://gardenscure.com/420/theories-speculation/105266-uvb-light-you-12.html

Oops am I allowed to do this? LOL

[Nirrity]

SSSC Durban-Thai Highflyers...

Yes IMHO we need UV-A as well as blue to support UV-B. UV-B alone pretty burns... I will see with my Phnom Penh... 3 hours daily now...

[c-ray]

I agree...whatever the sun puts out (at the tropics or wherever) that's what I want my plants to have

[guest]

hey,

the mega-ray 100 watt "all-in-one" bulb has a good amount of UV-A:
http://www.reptileuv.com/megaray-sb-100-watt-self-ballasted-flood-uvb-lamp.php

MINIMUM distance setting of 12" will produce approximately 150-200 microwatts per square centimeter (uW/cm2) of UVB and 900-1200uW/cm2 of UVA.

MAXIMUM distance setting of 20" will produce 50-75 microwatts per square centimeter (uW/cm2) of UVB.

So if there are 150uW/cm2 of uvb at 12" and 50uW/cm2 at 20" that means there is 3x less ubv at 20"...so we could assume the same for uva which would mean this bulb give s off 333uW/cm2 of uva at 20"...better to hang it 24-26 inches from canopy.

[c-ray]

very good
specs should be easy enough to find for the tanning bulbs too
and what about uvC?

[OldeSkool]

If you're going to use the UVB, should you use it just when you start to flower, and then taper it down the closer toward harvest you get? Much like the maps would show? It seems that from solstice to equinox in the northern hemisphere, the UVB keeps decreasing toward harvest time.
That kind of infers that the UVB helps water-trapping/UVB protection resin be produced at and for the hottest periods of the plant's life (for drought resistance).

Also, as the map shows, the region where the UVB is the most intense would grow almost no plants, ie very high altitude, specifically in asia over China. Heck, Afghanistan (at least where plants would grow) isn't even in the high spot, while China, Tajikistan, some of Pakistan are, but these places are more than two miles in altitude - not a lot of life there.

What really seems to be happening is that UVB produces morphological changes in the plant where the leaf is actually made a little bit smaller. Smaller leaf, same amount of trichomes... seems like one of those illusions... you're smoking less material, but getting more high. Less overall yield, but of a more potent plant... if the scientists are right, anyways.

[Nirrity]

I haven't seen or see any trichome changes at all with my PP. I think all changes are within trichomes. it's a quality not quantity. And yes cannabis grows where 'not a lot for life there". One of the most potent Kush was from Pamir, where the climate is extremely severe, dry, a lot of UV and day/night temperatures...

UVC is harmful... I don't think even freaks like us should go that far.

[sleeping village]

I've used UVB(280-320nm) for years....It has never been intense enough because of the bulb I was using. These 60 Watt Mega-Ray bulbs really sound like the ticket. Equator sun UVB output with little heat, sounds right on.

Two just showed up for me today at the village post office. I'm waiting on a light mover to complete the UVB portion.

[Nirrity]

It seems that repti uv bulb is very uneven and usually have far broader spectrum.. Though... Well, my Philips TL12 is also emits in visible part, but cause a sunburn within 15 minutes at the distance of 6". At the 1" it's a matter of one minute. But it's 9 watt lamp.

[sleeping village]

http://www.beautifuldragons.503xtreme.com/ResearchMegaRay.html


i don't know if this has been posted here, but it shows the output of the Mega Ray bulb at different distances.



output for a list of reptile bulbs.

http://www.beautifuldragons.503xtreme.com/Researchmain.html

[c-ray]

nice links ^

this just in ...Mega Ray is working on a halide bulb which their site says will be shipping May 15 -> http://www.reptileuv.com/megaray-metal-halide-uvb.php

there is also a high output zoo bulb that I never noticed before but check out the restrictions on ordering -> http://www.reptileuv.com/megaray-eb-60-watt-flood-zoo-lamp-kit.php

[sleeping village]

yeah, the zoo unit looks bitchin', maybe better for a bigger setup. the 60 Watt version is attractive to me because of the low heat and the 10 -12 inch distance "near sunlight" output works well with my 1000Watt HPS as far as setting up and usabilty. two on a light mover at 10-12 inches should cover nicely and give the plants a break for a wee bit...

[Green Supreme]

Something I bumped into today. It may have some pertinent info. Peace GS

http://zoomed.com/Library/ProductDBFiles/Reptiles%20and%20UVB.pdf

[Green Supreme]

Some things Marihuanaman thinks about uvb. Peace GS

http://www.youtube.com/watch?v=IPcpt3Be28o

[Nirrity]

Hello c-ray!

Some interesting details.

Looking for a reliable source for both UV-B/UV-A and blue spectrum I found this thing. What do you think of these parameters?

All bulbs go with UV Shield, but it seems there is something special for 400 watt DE MH, as well as higher wattage...

The only problem are these figures can be trusted? Looks way too unstable - 2000 watts without UVS emits UV lower than 1000 watt, and miserable figures for a 250 watt and lower wattage...

[andy95]

HI
I used for UVB source Philips HPL-N 400w , construction similar to Zoo laps,
one difference - all bulb phosphor coating. Relise plenty good amount UVB. I used it from 0.5 to 1.5 meters from plant. Simptoms sun overdose - smaller leaves, stunned grow - too much UVB. When I turn MH without HPL-N . Leaves start grow faster. May be UVB good in smaller quantites. I 'll continue expriment with little 125w HPL-N on different distances.

[andy95]

Look on UVB output
Blue spectra HPL-N 400W

[Brick Top]

There is a rather large amount of detailed information about UV light rays and their effects to be found following the link below.



The effect of ultraviolet radiation on the accumulation of medicinal
compounds in plants


Wen Jing Zhang a,b, Lars Olof Björn a,c,⁎
a Lund University, Department of Cell and Organism Biology, Sölvegatan 35, SE-22362 Lund, Sweden
b QingHai Normal University, Key Laboratory of Resources and Environment in Qinghai-Tibet Plateau, Ministry of Education, Qinghai 810008, China
c Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, School of Life Science, South China Normal University, Guangzhou 510631, China


http://www.elsevier.com/authored_subject_sections/L07/misc/Fitote_80_p207.pdf