LED grow lights... input please.

[Old_as_Dirt]

http://www.growwithleds.com/uofmstudy.htm

[Tokudai]

That study is worthless - Why would you put a 400 Watt HPS Lamp ~ 6 feet away from the tops? 6 FEET?

Has ANYONE ever gotten an LED setup to (through) flower and compared the (only relevant calculation for us) grams/watt? I'm still waiting for that one..

[Wh173]

That study is worthless - Why would you put a 400 Watt HPS Lamp ~ 6 feet away from the tops? 6 FEET?

Has ANYONE ever gotten an LED setup to (through) flower and compared the (only relevant calculation for us) grams/watt? I'm still waiting for that one..

my friend have in second experiment 0.5g/W

[PearlJamFan]

Here is an some photos of a test I started. These are 2 clones taken from a plant started oustide, it is bag weed to boot. The pics were taken 2 days after transplanting from a peat pellet to the square container. They were under approx. 75w of CFL during rooting. There are 6 other sisters under a 400w mh. I will post comparisons as I get time to do so.

Here you go.

[PearlJamFan]

A couple of more pics.

[PearlJamFan]

Here are some photos taken just minutes ago. This will be day 5 under the LED's. In the last 2 photos are for comparison. The 2 on the left are the LED ones, the 3 on the right are the 400w MH ones.

[roadrunner]

Hi folks,

I'm new in LED growing and got only basic growing knowledge, so maybe I can get some helpful comments here.

History:

- First I started with 54 High-Power LED's (6 UV, 30 Red and 18 Royal Blue) in a little growroom (enough space for Bonsai ;-) ; only as an experiment).
Result: The plant growing speed was very slow :| . My reference plant on my balcony grows faster and higher.

- In the second step I've added some Luxeon LED's
Result: Wow - the growing speed increases potentially. The mass of the plant is now greater as them of my reference plant. Additionally it got more and bigger bastard brachnes!

- Now in my third step I use pulsed light (since two days). My current problem is primilary the temperature. With the non-pulsed Luxeons it was 28 degrees, now only 22. Will this be a problem? Without the fan (used to cool the Luxeons, which isn't needed with my pulse frequence) the tempereature is 26 degreed (optimal), but the humidness is about 70-80 per cent (50 with fan).

Have anyone made experience with pulsed lights. Are there really better results in growing? What frequencies and pulse-on/off times are you using?

What are you thinking about the healthiness of my plant (see attached pictures)?

What are you thinking about my project?

Do I really need a CO2-reactor to speed up growing?

In my opinion, growing with LED's is really possible, but you need a lot of them or Luxeons, but you can save a lot of costs for electricity. And the life time of LED's is much longer then of HID's, especially if you are using pulsed light (not overdrived).

[phytokind]

These homemade LED arrays are awesome, like Disco Star Trek or something, but why don't you just use the SolarOasis LEDs? They seem to have figured it all out already, the only problem might be the high cost.

[roadrunner]

The SolarOasis LED's are really to expensive!!! And I wan't to control the LED's by myself (current, pulsing). And why do you think, they solved the problem? In my opinion, they doesn't have anough power, as I experienced for myself with the High-Power LED's. With the Luxeon's, the growing speed increased so much, even though the wavelengths aren't 100 per cent optimally.

Sorry, but I would be appreciate for helpful comments regarding to my questions.

[phytokind]

Well check out this thread from a different message board, I think that on about page three he says that he got like 3oz from two plants just using solaroasis, but he used eight bars, which of course cost a lot.

http://hg420.com/showthread.php?t=16360