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| I have been a fan for awhile but this year spent the money. I bought the equivelent wattage of 400 watt hid/hps in led's and i have no complaints....just rave reviews! I have grown african violets...tomatoes and roses at a success rate i cant explain. I researched for months and finally found a company that had a GREAT product. I would refer them to anyone. The electric savings alone are worth it and i dont worry about burning my plants or my house down! My friend owns a greenhouse and he bought 40 of the red spectrum to increase his profit and he is so happy. Dont listen to the critics...they work....i use them!!! :) |
Follow-Up Postings:
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- Posted by cannabisgrower 5a (My Page) on Sat, Jul 26, 08 at 17:56
| really... good to hear that you're not worried about burning your house down. what is the equivalent wattage, by the way. I grow my african violets on my window sill, why would I want to use led's on them? my roses grow great under just shop lights, and I've got a CMH lamp growing my tomatoes that works great. I don't think it's a matter of critics or whether they work, but there are other cheaper and better lights out there. The one and only purpose for LED grow lights is if you wish to grow cannabis plants in a computer case or a small drawer for example, besides that, it's conventional all the way. Long wave length LED's at 730nm are also useful to stimulate flowering in long night plants, where the required period of darkness is shortened by 4 hours. This also has applications for cannabis, which I use in my own personal grow. Glad to hear about your enthusiasm though, there's nothing nicer to see than an enthusiastic gardener. Sativa. |
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| mrled, Where did you get your LED grow light at? |
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| canna-gro, I am glad to see that someone here has a clue about the phytochrome function on long-day and long-night plants. Have you used the 730nm to shorten the dark period of a long-night plant? I hoped to to eventually get to experiment with using 730mn LEDs to see how short a dark period you can successfully get away with. I would like to hear a description of what you were able to accomplish. How short a dark period, how much 730nm light was required, was your dark + light period still a full 24 hours, and did it result in more vigorous growth than normal? I have known that Pfr changes to Pr at 730nm, and Pr reverts back to Pfr at 660nm. An easy way to get 660nm is to use a Sylvania Gro-Lux Standard lamp(NOT the Wide Spectrum one) which peaks at 660nm at the red end. LEDs are the only convenient way to get 730nm. As for now, I have no interest in using LEDs for photosynthesis. Currently there are NO industry standards for LED specifications, and the marketing hype in the "plant grow" arena is unbelievably optimistic, if not downright deceptive. Zink |
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- Posted by cannabisgrower 5a (My Page) on Mon, Aug 4, 08 at 21:48
| Hi zink, sorry I didn't see the question. In 1959 Butler et al. discovered the phytochrome flower inducing pigment. In darkness, the reaction Pfr -> Pr occurs, and the Pr promotes flowering in short day plants. Conversely, Pr inhibits flowering in long day plants, and Pfr is the active form in this case. In total darkness, it requires 4 hours for this conversion to take place; however, just a FLASH of 730nm light during darkness will convert Pfr to Pr, which means that instead of requiring a 12/12 light dark cycle for cannabis for example, you can use a 16/8 cycle, with a flash of 730nm at the beginning of the dark cycle. For this purpose, I use a home made array of leds mounted on standard electronic perforation board, powered by an ac adapter, of 50 leds, that I purchased from Hong Kong for $100 for a lot of 1000. They do not normally stock 730nm, but they did a custom run for me on request, I just had to wait a little while. I expose my cannabis plants to one minute of 730 light. It is just a very faint deep red, but it is enough light to work by. There was a very nice article about it on the internet 4-5 years ago, but I can not currently locate that exact article, in which they talked about mango and other long night plants, but did not specifically mention cannabis. I hold the array in my hand and manually illuminate all of the recesses of my garden, which is just a little 3 x 5' closet grow I built in my cellar. :) Sativa. |
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| Hello, please help. I have been doing alot of research on LED technology lately and need some help figuring out the viewing angle and light intensity/mcd and how they change in relation to each other. I want to build my own LED grow light and I want to purchase some LEDs from a manufacturer and they gave me these characteristics: 5mm LED straw or dome type. 20mA. 461.5nm 2750mcd at 62.5 viewing angle 3.07 volt can somebody tell me if these are any good. i've tried to compare but there are so many, i really need some opinions on these. Thanks a lot. Really appreciate it. |
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- Posted by fernandoray (My Page) on Tue, Aug 19, 08 at 8:18
| If you are looking at a 5 mm LED you looking at a high brightness led and not a Hi-Power led such as those made by Cree and others. Hi-Brightness leds just don't have any power to do what you want. If you haven't already ready done so, that a look at www.greenpinelane.com where they have tested various led systems and have a number of people building their own. |
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| Working on a little project with about 140W+ of LED. Of course self built or it wouldn't be affordable. Using mixture of Red (630nm), Deep Red (661nm) and Blue 3w each except for the Deep Reds that are 5W. |
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- Posted by weedbegone (My Page) on Thu, Sep 25, 08 at 15:05
| Just finished my project. 900 T 1/4 leds @ 450 ea. red & blue. 76.5 W total dissapation. This baby throws out some light! Lights up the entire room. Much better than anything on the commercial market! The light ratio is actual 64% red (630 nm)/36% blue (472 nm)since the reds throw out 8000 mcd each, blues 4600 mcd at 30 deg. |
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- Posted by moman_2008 (My Page) on Sat, Oct 18, 08 at 3:07
| I think LED's are a very good choice for the advanced grower. It takes some time to figure out the wave lengths and how to best utilize them for your plants, but once your winner setup is up and running you get the reward of growing great plants while saving energy costs. |
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- Posted by californian 10 (My Page) on Sun, Feb 6, 11 at 13:27
| How many of you grow plants to sell, and if so how long will it take for those LED lights to pay for themselves? I use a homemade fluorescent light setup that uses 7 four foot long T8 tubes per a shelf, and they pay for themselves on the first batch of tomato seedlings I grow under them. |
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