Karl H.

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Karl H. last won the day on March 5 2015

Karl H. had the most liked content!

About Karl H.

  • Birthday 03/03/1996

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    CP´s of course ;) but also physics, electronics, cryotechnics, Optoelectronics, laser technology, drums, piano, and guitar

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  1. Hello, i also grow some plants under low power LEDs. At the moment i´m developing a LED-module with Osram Duris E5 diodes. I run these diodes at 100mA, so it´s more of a mid-power LED. I´m going to mix 3000K 4000K and 6500K. This should work great. regards Karl
  2. Karl H.

    LED Grown Plants

    These are some Plants wich i grow under LED lights. I hope you like them.
  3. Hello, i will make some photos of plants growing under the same light mixture soon. I also finished the setup with a new controller board. Five LED modules can be connected together onto one power supply. I also put two temperature controlled fans on the heat sink. greetings Karl
  4. Hallo, i just want to show you my new LED grow light. The whole thing is about 10x4x4 cm big. So ist actually very small considering that it consumes about 30W. Hope you like it :) greetings Karl
  5. Hello, at fist i tinned the aluminum-core PCB (star pcb). To do this i screwed a 4mm thick copper plate to a large and flat soldering iron tip. I startet to heating the star-PCB until the tin has melted. Then pushed the pcb on a heatsink. (The black surface next to the copper surface) After the pcb was cold i sanded down the tinned soldering pads a bit, so that the LED coul be put flat on the soldering pad. So i placed all three LEDs on the PCB and started heating it again with the soldering iron. After the tin has melted and the LED was soldered on, i pushed the PCB on the heatsink. pictures can be seen here (pic 3,4 and 5) http://forum.carnivoren.org/index.php?/topic/34093-led-informationen-und-dokumentation-fuer-eine-zusatzbeleuchtung/
  6. Soldering sourface mount LEDs isn' t very difficult. It is even possible to do this with a slightly modified standard soldering Iron. I soldered many LEDs without a reflow ofen and solder paste just with a soldering Iron, and the LEDs are still working perfektly. ( since 3 years now) It anyone is interested in how this method works i will make a short documentation.
  7. Here are some older pics of my cephs under LED. The pics were tanken after about 6 weeks under the LED light. http://forum.carnivoren.org/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=43996 http://forum.carnivoren.org/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=43991 http://forum.carnivoren.org/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=43994 http://forum.carnivoren.org/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=43995
  8. Hello, yes i´m using the PT4115 buck converter. The shunt resistance is at about 0.15 ohms. That gives me an output current of 0.7 amps. I got my LEDs from a german supplier called Reichelt.
  9. Hello, @ vincent, I recommend using osram oslon SSL diodes. You can get them in nearly all colors needed for a good grow light. I also use these LEDs. Some pictures can be seen here: http://forum.carnivoren.org/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=52149
  10. Thank you. :) Making the PCB´s on your own is probably the best, and cheapest way. I also made all PCBs by myself. The driver costs only 2€ of materials to make it.
  11. Hello, every time i changed a value i sow out 50 seeds. All seeds were from the same plant. greetings Karl h.
  12. Hello, no i´m not making the assumption that the wavelengths are 100% efficient for plant growth. They are probably not 100% efficient. To figure out the efficiency compared to the 840 flourescent tube i made an experiment. I saw out different Plants (mainly sundews) on glass wool. The seedlings all got the same amount of fertilizer. One group was illuminated with my LEDs an one group was illuminated with the fluorescent tubes. The input power of both the LEDs and the tubes were monitored constantly. First i weigh out the seedlings every two days under the flourescent tubes. With this data i was able to determine the biomass implementation per time division on a given input power for the photon source. Now i tuned my LED light, to get the same biomass implementation per time division, as with the flourescent tubes. At some point i reached the same biomass implementation with my LEDs as with the flourescent tubes. Now i started, to tune the LEDs so that the seedling also get the same coloration as under the flourescent tubes. I did this by measuring the pigment densitiy with a standart camera an an avaluation software. (by simply comparing the color saturation on different parts of the plants) After 6 months of tuning measuring an comparisons, i got the same growth results of the seedling, under the two lamps. (Of course i sow out new seeds every time i changed a value on my LEDs. As you can imagine it took a very long time to compare the two lamps) As i now got the same growth results with the flourescent tube and the LEDs, i compared the input power. The result was a 80% energy drop of the LEDs compared to the input power of the 840 flourescent light fixture. The result certainly isn´t 100% exact. But i was able to minimise the measurement inaccuracy by using high highly accurate laboratory scales. So i think i got pretty close, to the actual efficiency value. greetings Karl H.
  13. Hallo, thanks for the feedback. :) The divers have an efficiency of approximately 92-96%, depending on the environmental conditions. Compared to a Philips 840 T5 fluorescent tube, i´m able to save nearly 80% of Energy, with the same area illuminated, and the same or even better growth an coloration. But to get such a high energy reduction, the driver has to be tuned very precisely. greetings Karl H.
  14. Hello all, i just wanted to show you my new homemade LED grow light. I use fourteen different wavelengths in my grow light. On my current LED Panel four of the fourteen wavelengths are fixed, as kind of a "background radiation". The intensity of the other ten wavelengths can be adjusted, via the LED driver i built for my grow light. This way you are able to create whatever mixture you want within the fixed wavelengths. But enough sayed (I hope you can understand what i tried to say. My English isn´t that good) Here are some pictures, of the LED panel, and some random wavelength ratios. five Stage LED driver: LED panel: random wavelength ratios Some feedback would be nice. :) greetings Karl H.
  15. Hello, i finished my LED Spot light with the quick ´n´ dirty driver panel today. I still have to make some changes on the driver settings, to get a more pleasant light. I also started the 48h burn-in tets today, to see if any component gets too hot. What du you think? regards Karl