Why I like LED

Kebz · Jun 20, 2013

Well I figure theres far too much cussing LED's for being bunk and far too little LED bud porn

Enough jaw jabbering.....

This girl Lives at the back of the room finishing.

O.K.....Enough with that pink already
Lets take a closer look

Oh yeah and one for scale

Do what you do and do it well, i'm still practising and trying my utmost to improve.
Thanks to Bodhi for creating Jabba's Stash.

highzenburg · Jun 20, 2013

What beautiful flowers #

Kebz · Jun 21, 2013

Thank you highzenburg.

I like you, my fellow farmer, appreciate her aesthetics, I'm fortunate to have stumbled upon Bodhi, I've got a single Goji OG about 2 weeks in flower and can't wait to try more of his strains just too much on my plate right now. Even outdoors is full ;-)

The above Jabba's Stash is a cross of Snow Lotus and Bubba Kush I was fortunate to get a pheno leaning towards either parent.

Any way, too much jaw flapping, Bubba Pheno;

Kebz · Jun 24, 2013

Swany · Jun 26, 2013

Looks like your grow partner is Jack Frost ;-}

Kebz · Jun 26, 2013

He did some consulting! The panels I use feature 5watt, IR and UV

diodes and i'm getting really good trich production compared to HPS or MH.

Total number of diodes featuring IR and UV;

UV: 410nm, 7 x 3w leds

IR: 740nm, 3 x 3w led

This is over the 7 panels. Whenever working in my space I always turn off panels before working directly under them.

Swany · Jun 27, 2013

According to Ed R., UV helps the plant produce thc. I was looking into fabricating fixtures to hold tanning bed lights. LED UV would be better in the long run. I'll have to look into how much the 71" tubes put out and how much a strip of diodes puts out. Not that I know how much is needed, but I can figure that out I believe. You're set up is certainly working with 21w of UV.

Kebz · Jul 2, 2013

Seems like time for an update.
Most plants in shot are between 2 - 4 weeks of 12/12 and theres 3 very nice looking hazeman's mystery girls who have been cloned and are showing that something special.

Kebz · Jul 2, 2013

250watt hybrid frankenstein LED and CFL veg space.

Kebz · Jul 3, 2013

Theres a 300watt panel above the bleached out leaf, you can't see the panel in shot but it uses 3 and 5 watt diodes, the 5watt are responsible for bleaching the leaf event at 14inches, but just that one leaf!

Swany · Jul 4, 2013

Kebz said:
Theres a 300watt panel above the bleached out leaf, you can't see the panel in shot but it uses 3 and 5 watt diodes, the 5watt are responsible for bleaching the leaf event at 14inches, but just that one leaf!
View attachment 325088

Kind of a trippy picture ;-} Love hearing that LED is working

EVOKE · Jul 4, 2013

good work kebz... awesome plants...

Kebz · Jul 4, 2013

"Swany, post: 1079087, member: 43086"]Kind of a trippy picture ;-} Love hearing that LED is working[/quote]

Me too brother Swany, me too!

At first, as I was dialling things in and using less Watts, I started to believe maybe i'd made the wrong call (wouldn't be the first time)!

But as i've increased power and incorporated more panels the results have been undeniable, i have an easier working environment, less work and greater THC and resin production while maintaining numbers on yield although dropping from 1200watts to 850watts. It might not be for everyone, but it sure is for me :-)

Thanks evoke, Its more the plants and the set up, i'm a little frustrated at times, I go to water, and no need there still fine, I wonder what my jobs is sometimes!

I do think you need big numbers for LED, i'm running 850watts, and 11 plants in an area of 36feet, the good thing is even those plants not directly under LED panels are blooming lovely! I'd still like to increase to over 1000watts waiting for the right panels to be restocked.

I'm a hands on kinda guy and im glad its the growing season outdoors to keep me busy, LED's seem to be on a much more relaxed work schedule than HPS. Has a lot to do with the ambiant temps and relative humidity being easier to maintain in imho.

highzenburg · Jul 11, 2013

I think your plants look amazing. I do have a few questions for you though.

Are you only using the magenta led?
If so how many lumens are being produced?
Are single colored led lights going stretch out your plants?
And finally is the increased yield worth the price of the bulbs.

Kebz · Jul 12, 2013

Thanks highzenburg, I try and sometimes get things nearly right.
I'm using panels with 7 spectrums. So the light produced is magenta but its a mix of the following;

I.R 740nm Red 630nm, Deep Red 660nm, Orange 610nm, Blue 460nm, U.V 395, White 15 - 20,000k.

I'm using two different types of panel 6 produce the magenta type light and one has the same spectrum but in different ratio's and produces a much whiter light. The plants start off under the whiter light and progress through the flowering space.

Led's put out a lot less lumens than hps, but thats how they save energy, they only push light that the plant can use. PAR (Photosynthetically Active Radiation) is the part of the spectrum used for photosynthesis (400nm - 700nm) and is a far better measure of useable light available to the plants.

All the energy I put into the led units (except that used to drive the in built fans) is pretty much used to produce useable light, obviously a little is lost as heat.

Useful information;

www.sunmastergrowlamps.com/SunmasterPARWatts.htm[/COLOR]
PAR and Plant Response Curve
Just as humans need a balanced diet, plants need balanced, full-spectrum light for good health and optimum growth. The quality of light is as important as quantity. Plants are sensitive to a similar portion of the spectrum as is the human eye. This portion of the light spectrum is referred to as photosynthetically active radiation or PAR, namely about 400 to 700 nanometers in wavelength. Nevertheless, plant response within this region is very different from that of humans.
The human eye has a peak sensitivity in the yellow-green region, around 550 nanometers. This is the "optic yellow" color used for highly visible signs and objects. Plants, on the other hand, respond more effectively to red light and to blue light, the peak being in the red region at around 630 nanometers. The graphs below show the human eye response curve and the plant response curve. Note the vast difference in the contours.

In the same way fat provides the most efficient calories for humans, red light provides the most efficient food for plants. However, a plant illuminated only with red or orange light will fail to develop sufficient bulk. Leafy growth (vegetative growth) and bulk also require blue light. Many other complex processes are triggered by light required from different regions of the spectrum. The correct portion of the spectrum varies from species to species. However, the quantity of light needed for plant growth and health can be measured, assuming that all portions of the spectrum are adequately covered. Light for plants cannot, however, be measured with the same standards used to measure light for humans. Some basic definitions and distinctions follow that are useful in determining appropriate ways to measure the quantity of light for hydroponic plant growth.

Blue light by itself produces shorter plants (reduced internode lengths) which are dark in color. In contrast, red light produces plants with long internodes with softer growth (Nelson, 2003). A mix of both allows for good plant processes and growth.

As for cost, leds did seem to be falling in price earlier in the year but have seen a resurgence in costs as people seem to have rediscovered them to some degree and old companies are launching new more expensive led units. We have yet to see the high power 10, 20 and 50watt chips being utilised for commercial greenhouses, which should further reduce costs for all users, it really is just a matter of time.

I would like another 1000watts of led but the price is offensively high, i'm going to wait until after the outdoor season and hopefully we should see falling cost next year, tho the obvious solution is to build my own led as they are relatively cheap to produce as opposed to buy.

LEDs reduce costs for greenhouse tomato growers, study shows

Mitchell and doctoral student Celina Gómez experimented with light-emitting diodes, which are cooler and require far less energy than traditional high-pressure sodium lamps used in greenhouses. They got the same yield - size and number of fruit - with high-pressure sodium lamps and LED towers, but the LEDs used about 25 percent of the energy of traditional lamps.

http://www.purdue.edu/newsroom/rele...r-greenhouse-tomato-growers,-study-shows.html

Kebz · Jul 12, 2013

I posted this in anothrer thread but it seems important enough when considering led to repose here;

When looking at the spectrums in led lighting it is highly important to consider the 'Emerson effect;

When Emerson, a scientist, exposed green plants to differing wavelengths of light, he noticed that at wavelengths of greater than 680 nm the efficiency of photosynthesis decreased abruptly despite the fact that this is a region of the spectrum where chlorophyll still absorbs light (chlorophyll is the green pigment in plants - it absorbs mainly the red and blue wavelengths from light, leaving the green light to bounce back and hit our eyes). When the plants were exposed to short-wavelength light, (less than 660nm), the efficiency also decreased. Emerson then exposed the plants to both short and long wavelengths at the same time, causing the efficiency to increase greatly. He concluded that there must be two different photosystems involved in photosynthesis, one driven by short-wavelength light and one driven by long-wavelength (PS1 and PS2). They work together to enhance efficiency and convert the light energy to forms that can be absorbed by the plant.[1]
The light excites the chlorophyll molecules at the reaction centre and causes an increase in energy. As themolecule becomes less excited, its energy is transported through a chain of electron carriers to the nextphotosystem which does much the same thing and produces energy-carrying organic molecules.

The combination of red and deep red is 'HIGHLY' significant, to plant growth, process and bloom.

Seamaiden · Jul 12, 2013

EXCELLENT information you've shared in this thread, Kebz! Really good. Thank you!

tags420 · Jul 12, 2013

Lots of good info right there kebz

The way around the Emerson effect is to not use far red specifically. The reason nasa supports White/Red spectrums is because by using white chips that peak around 630nm the broadness still covers all the necessary 660nm. But without the negative emerson effect.

Kebz · Jul 12, 2013

Thank you good folk, learning as I go. I guess that might explain why some led's seem absolutely useless and some seem to deliver to varying degrees. Especially the older tri band (ryb) perhaps only using 630nm red with no added white or deep red?

Kebz · Jul 12, 2013

And back to why I kicked this off more bud shots!

I'm really liking the Hazeman Mystery girl packs, got a couple of interesting smelling girls :-)

Numero Uno (you can see the led bleached leaf in shot)
She's a big buxom girl with a fruity funky, mango like stink.

And your close up

And numero.....er ..... two
Much, much smaller buds but really dense and weighty.
A stink I've never smelled before like flowers and rotten poo! Sorry but if i'm being honest........... and er, I kinda like the dirty funk of a bouquet, its offensive!

Your close up

And Just for good measure Bodhi's Goji OG

Just popping a couple of;

Karma Genetics Mirre,
Bodhi's Sunshine Daydream
Jabba's Stash x Boss Hogg. Let the show continue.

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