Supplemental UV

stardustsailor

stardustsailor

Well-Known Member
Positivity said:
How's this violet led setup sds...http://reefll.com/index.php?route=product/product&product_id=58

On a sinkpad with 5800mW....405nm - 425nm

Was considering one led dead center on my light. Not quite sure it would hit my 2 x 4 area evenly enough though. 2 leds would seem to be way overkill.

Interesting design..trying to find one I can incorporate at 1a current
Click to expand...
Yes.Seen it before.
Mainly UVa .
More 'pronounced' effects of blue 430-450 ,regarding photomorphogenesis ..
(plants will literally 'point' /'turn' towards that led ! Phototropism at it's best ! )
 
bicit

bicit

Well-Known Member
stardustsailor said:
If 10-12% of light output power is at UVB range then ,you've to know the actual output of those bulbs ...
(CFLs are not very efficient ...And have a poor light spread ..
But I guess one or two cfls ,will show some effect ...
Not an "WoW ! " effect ,but something will be different ...
I used to have them ,along with my HPS ..
But due to their high price,short operational life and low ewfficiency ,I quickly dropped using them ...Although ,they did affect positively the herb quality ..
(Quite of few people's opinions and claims,after 'testing' the herb ,
experiment was done,plenty of times ..)

I'm waiting for some affordable and efficient UVb leds to show up ...
It will take only couple of them ,per sqr. meter ...
Click to expand...
Well T8's and T5's offer better coverage and power. However it's really easy to over power a small space.

Arcadia 2% and zoomed 5% T8's seem like a decent match for those recommendations for constant illumination. However my concern is the where the other 98-88% of the power is going. Probably not ideal light for growth.

Maybe higher power bulbs with interment illumination is a better approach?
 
C

CannaBare

Well-Known Member
Reptile UV has a great UV lamp for 50 bucks that covers a 30'' diameter circle. I just got one. I realllly like the LED setup constant with supplemental bulbs. It helps me to raise my temps throught the day and cool down at night to simulate nature :)

Get the self ballasted lamp
ReptileUV.com
 
canadian1969

canadian1969

Well-Known Member
Someone with better math skills than I needs to re-run these calcs.
1 watt/second= 1 joule
So 1 watt * 43200 seconds = 43200 joules

There is a straight conversion between watts per meter squared and joules per second per meter squared, far as I can tell.
1 watt/square meter = 1 joule/second/square meter
(I am probably confusing standard units or there are different conversions for spectral radiance and intensity etc.)

If the total percentage of UV is roughly 3% (ground based measure after atmospheric filtering as a percentage of total sunlight) it stands to reason that your total UVB in a grow space should be less. With LED we are talking a single wavelength rather than a cross section of UV light in general as is found in nature, but I dont think thats an issue for these purposes. Certainly could be a problem for critters who may need UVA & UVB.

Since 95% of UV radiation hitting the ground is UVA, and in this LED application we only have one wavelength of UVB, in theory (310nm) ...

So for a 1000 watts of LED light, we should look to include total 30 watts of UV. And therefore 1.5 watts UVB and 28.5 watts UVA if we wanted to replicate nature as close as possible. No?

I am thinking 5-10 watts of UVB should suffice. Now I am wondering if lower level exposures over time are better than periodic high intensity exposure. For the plants I mean. (back yard versus tanning bed)
 
canadian1969

canadian1969

Well-Known Member
Ideally yes. It seems that's the shortest wavelength you can get in 3 watt packages. Check out the site, they have others but power drops right off. I think anywhere in the UVA/UVB transition area would be fine, but this is all theory. Lots of UVA may do the job too. Dunno.
 
canadian1969

canadian1969

Well-Known Member
not the point of the thread. I could use tanning bed lights too, floro or hid, I was looking to see if it is possible with LED.
I got some more info from a company called SnowDragon, they can make lamps from 1 watt to 500 watts, but ....

"I have checked it with our engineer .
We have 360 - 370nm , 370 - 380nm , 380 - 400nm and 400 - 410nm UV led now"
 
Positivity

Positivity

Well-Known Member
UVB makes the herb a bit stonier/complex if you ask me. The floros are good enough I think, until better options in leds come out.

The floros, especially t5 Arcadia and reptiglow, have UVB, UVA, and a few other peaks. All areas of the spectrum most leds miss. Of course you can do without them...but when trying to grow indoors I wouldn't want to miss a big chunk of the spectrum.

To hit all those same wavelengths with these narrow band UVA/UVB leds you would need a few of each...spread appropriately so it hits the canopy evenly...mucho complicated and expensive.

Or just do without. My friends grow the dank outdoors so it's easy to see the difference in potency. Can't be showing up to the party with bud light.
 
stardustsailor

stardustsailor

Well-Known Member
INTEGAR, Institute of Horticulture Technologies:
Innovations and consultancy by young German entrepreneurs

With seven years experience working as university researchers in Germany, Engineer of Horticulture graduates Nico Domurath and Daniel Brohm have set up a new consultancy called INTEGAR.

According to Nico and Daniel, the majority of horticultural advisory services in Germany are currently provided by the government, or at federal level, so they established INTEGAR – Institute of Horticulture Technologies in 2013 to address the need for more private horticultural consultancy firms.


“We thought this was the best time to found our own company because the demand for horticultural consultancy is increasing,” says Daniel.

INTEGAR has also developed a customisable LED-Solution (LEDGRO). The lamp can be operated by smartphone, tablet and USB. Beside red and blue high performance LED the lamp contains warmwhite and UV-LEDs but also LEDs depending on customers demand. Every light colour can be programmed separately. So demand light programs and flexible day-night development are possible. LEDGRO is currently being used by scientists in a research capacity; however INTEGAR would like to roll it out to commercial growers in the future.

“With this, you can program light cursors that imitate the run of the sun; or you can program only red or blue or UV [spectra]. There are so many ways you can use it.”

“Our aim was to make it as flexible as possible so you can do everything with it,” Daniel says
Click to expand...

http://www.hortidaily.com/article/7794/Innovations-and-consultancy-by-young-German-entrepreneurs

LEDGRO_platine.png




uvled.JPG


http://www.roithner-laser.com/led_deepuv.html#enhanced

http://www.roithner-laser.com/pricelist.pdf
(pdf page 71)


(It might be also Roithner UVLED-385-1200- SMD ...)
 
stardustsailor

stardustsailor

Well-Known Member
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