UV Leds ?

Is there an UV thread similar to the "far red" one ? I'd like more infos about potential use and misuse of UV Leds. I'm not growing marijuana, but using LEDs for indoor greening (fragrance+vegetables). Does it really help fighting fungi and bacterial diseases ? How about inducing flowering ? What doses are dangerous ? Any imput is welcome; thank you very much.

based on kite highs posts here on riu i added a 54w t5 to my grow. it states that it delivers 12w of uvb.

Uvb diodes are crazy pricey and also very low power...as far as i know.

There is plenty of info online about safety and uv exposure. i kill the uv whenever i am attending to my ladies.

Thank you for your prompt response. I think there was once a SurpaSPL post about short wave spikes in high blue COB light (6500k+) inducing the plants to think it's actually beeing bombared by UVA/UVB.

The price for uvb chips are expensive i wonder what no name led fixtures "claim" uvb in the spectrum like KIND or the like

KarmaPaymentPlan said:

The price for uvb chips are expensive i wonder what no name led fixtures "claim" uvb in the spectrum like KIND or the like

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KIND is saying UVB or just UV?

For the time being I think T5 HO bulbs are the most economical way to go.

Zoomed for the USA, http://www.drsfostersmith.com/product/prod_display.cfm?c=6016+6028+25696&pcatid=25696

And Arcadia for Europe,http://arcadia-reptile.com/fluorescent-lamps/t5-d3plus-desert/

This is the guy we want to talk to. Tell him we want a UVB based white light . I love this guy cause he did something that others said shouldn't be done.

Checked it out: min 365nm - not enough to make UVB. 365nm seem widely available, and nichia claims power output record: http://www.nichia.co.jp/en/product/uvled.html

FranJan said:

KIND is saying UVB or just UV?

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I'm not sure i don't keep track well of other lights but i know I've seen it on some of those rebranded lights i was just wondering what they do use

CLW says uvb but i think they have a non diode uvb source???

What do you guys think of these, I know they are just UVA...

http://www.rapidled.com/12-solderless-led-violet-uv-kit/

I know THOR Labs makes a deep UV 265nm but crazy price $1100.00. Luminus Devices make some powerful ones but 365nm is as low as they go.
http://www.thorlabs.com/thorproduct.cfm?partnumber=M265D2
http://www.luminus.com/products/uv.html
http://www.qphotonics.com/Deep-UV-high-power-LED-lamp-30-50mW-265nm.html

at that short of wavelengths, you're probably doing more damage to biological tissue than good. not necessary in my opinion.

FranJan said:

I know THOR Labs makes a deep UV 265nm but crazy price $1100.00. Luminus Devices make some powerful ones but 365nm is as low as they go.
http://www.thorlabs.com/thorproduct.cfm?partnumber=M265D2
http://www.luminus.com/products/uv.html
http://www.qphotonics.com/Deep-UV-high-power-LED-lamp-30-50mW-265nm.html

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See that's the whole thing how much and how long. When I used it I had it on for 2 hours a day and I liked what it did. Having said that i was using a VIPAR at the time so any amount of light was gonna help .

I only run UV 4 to 5 hours

captainmorgan said:

I only run UV 4 to 5 hours

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what source of uv light are you using?

sethimus said:

what source of uv light are you using?

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answer is above, scroll back up (t5 reptile lights)

Short period of UVB is good for plant, however if the time is too long, the plant will be buried/damaged. I am actually in the middle of developing a LED light Bar which is used as supplement light on the side, which contains 70% UVB and 30% Red.

TS-leo said:

.... I am actually in the middle of developing a LED light Bar which is used as supplement light on the side, which contains 70% UVB and 30% Red.

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does it look like this? (though this is more of a 50/50)


haha, just giving you a hard time since you're new and your name reminded me of this light bar

My opinion is quite different ...
I've come up to the conclusion ,that the UV radiation has a minor positive effect (per growth cycle ) regarding cannabinoid and/or trichome concentration ,while at the same time the negative impact is / can be quite severe.

UV radiation should be used only while breeding ( under artificial lighting ) ,
in order to avoid / minimise the genetic drift ,towards a less phycoactive cannabinoid profile of plant(s).

Nevertheless , 365 nm diodes are more than enough for the job
and the radiation density should not exceed 10 W / sq.meter ,
while the duration should be kept under 6 hours per dia .

A highly phycoactive strain ( 20-30% THC ) will finish just fine
under normal 3K 80 Ra warm white LEDs.

In case that seed production is the priority ,
then UV radiation ,should help the current phycoactive cannabinoid profile of the mother plant(s),
to be passed-on to the next generation ,with minor or none of genetic drift ...

Cheers.