Somewhere in Amsterdam, back in 2007, I started developing a Led panel system for growing Marijuana with LED's, these webpages show you the different tests I did
with just a few plants in a 60 Watt, 40 by 60 cm system. Bigger systems were designed and tested here as well. These famous Hans Panels were the very first available that can actually:
Grow Marijuana with only half the electrical power of HPS.
Please note that this site is for educational purposes only.
Growing Marijuana is prohibited in a lot of countries. Don't grow Marijuana unless you are sure it is legal to do so.
Finally, You can purchase the LED Grow panels I developed
These pages are sponsored by the Bonsai Hero Trimming Tool
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March 18, 2018
Finally dry, because of the cold, it took a few weeks. Quality is excellent, the buds are loaded with cristals, the weight is a dissapointing 95 gramms, hmm, I did expect a bit more. If one of you guys could do a better job, please let me know, In the mean time, I will start a new set-up next week, 4 plants under a 300 watt white panel..
February 21, 2018
They are finished, looks like a good result to me :-) I will let you know the dry weight in a few days
The color variations are a bit weird though...
February 5, 2018
Ok,a good result is coming up, one of the plants will finish a bit early, the other 4 in about 2 weeks. Still not totally happy with the low stress training, bending and trimming out excess leaves, I expected more big cola's than the 5 I'll be getting now. It is probably wise to hire some external expertise for the next time...
Januari 14, 2018
Flowers are developing like expected, the plants look really healthy. By the way, the strain this time is Lemon Haze, nice and potent, flowering period is about 10 weeks. So the expected harvest day will be March 1.
December 26, 2017
Very bushy plant, but I want to remove the lower leaves and stems, they would create a lot of small buds, wasting nutrients and energy. I would rather have a 4-6 big cola's on each plant, and the way to achieve that is to make sure they are at an equal distance to the light source. This technique is also known as defoliation.
After defoliation, only the most promising stems remain, about 50% of the plant is gone. Please note many growers will go further than this, removing much more plantmaterial. I will repeat taking the lower leaves and stems off in about 2 weeks, when growth has stopped
For the first time, I transplanted the plants because I did not trust the soil they were in, and put them into fresh All-Mix. After a week or 2 of transplant shock, new growth appeared and they look very happy and healthy now. Switched to a 12/24 hours ccylce, flowering, a couple of days ago, and today also activated the Red led's, the Blue ones are Off. Please coem back for more.
December 1, 2017
Had some problems with brown crispy leaves, I think it was a Phospor shortage, probably caused by too cold and wet roots. I installed a heating mat under the pots and gave them some extra NPK, now the normal leaf colour is returning. In a few days they will be ready for flowering,
November 24, 2017
So far looking good, very bushy indeed. I still tie down the main stem, low stress training, to get more big buds out of just 5 plants.
November 17, 2017
I think the disappointing result was caused by old seeds and poor soil, for great results, I should have given the plants more attention.. So I have decided to do a retest. With 5 Lemon-Haze seeds in a 60*60 tent.
Oktober 22, 2017
They will be finishing a bit early, don't know why. But I will take them out in a few days, result will probably be ok, but not great... Sorry
Oktober 13, 2017
With over 3 weeks to go, I am expecting a great result :-) Please come back for more....
September 30, 2017
Plants are looking great, there are 5 weeks to go, let's keep up the good work :-). Forgot to mention, the total power consumption is 93 watt.
September 24, 2017
Overall growth has stopped, and flowers are developing fast, it seems they are much faster than with the Red/Blue panels. The panel is switched to flowering mode, with the extra Red leds, in about 6 weeks we will know the result.
Here is a picture of the output in Flowering mode, as you can see only 6 extra Red and Deepred Led's create a big difference, closer to the optimal flowering spectrum.
September 17, 2017
Switched to 12/24 hour light cycle, flowering, a week ago. Please note the panel is still in Vegging mode, this is to make sure the plants remain short and bushy, instead of becoming rather stretched and thin.
September 1, 2017
As you can see lots of growtips are developing rapidly. I will let the plants grow for another week or so, and I will keep tying the main growtip down, to increase their number until I have about 20 that could all become big cola's.
August 25, 2017
Only 4 plants this time, so I am giving them a little low-stress-training to get more big buds.This is done with a piece of rope, tying the stem losely to the side of the pot
Here is a picture of the output in Vegging mode, the high amount of Blue light made the plants very bushy, nice indeed
July 23, 2017 Finally a brand new Set-up, thank you for your patience
Here is the new product, ready for it's final test, as you can see it has a huge heatsink and no fan, so it is totally noisefree. Besides that it has a square reflector to make sure the light is spread optimal in a square tent. The seedlings go in early august, please come back for more.
Most of the work is done by a CREE CXB3590 COB, as you probably know it has a fantastic efficiency, there are many reports on the web showing great results. In this product, the COB is assisted by CREE XPE2 led's, to give better control of the plant's shape.
For the vegging period, 4 CREE XPGDRY are activated to improve bushiness.
For the flowering period, 6 CREE XPEEPR are added to stimulate massive buds.