Update: Week 4 1/2
On the left is the more "sativa-like" phen. It's definitely looking like a proper indica dom now really, so I should probably drop the name.
The one on the right with the cigs is almost 10" now, with node 10 just pushing through. Some slight yellowing, mostly old, but some may be from the recent transplant. I'm planning on flowering in a week or so...
I've taken out the CFLs, so it's just 170Watts of LED. I may add the CFLs back later on if I start to lose buds at the bottom...
Last edited by MajorCoco; 04-14-2012 at 12:48 PM.
Awesome thread! Do you know any specifics on how many lumens per watt the led arrays are achieving? I just figured that with 2700k and 6500k arrays it would be fair to compare lumens per watt to cfl or even hps. We like to look at the peaks of the par spectrum specifically as the most important points to hit, which is so vein it's rediculous. I think your lights look amazing. I guess I was assuming you were doing this thread because the lumens per watt per lifetime of the led arrays was preferable to cfls? Well, all the best in your growing botanical interests.
Wow....gotta say things are looking real good brother
Cheers ILP! I can be 100% certain that the LEDs are drawing 84W each because I've measured the voltage with a multimeter. What I can't be so certain of is the actual output. I don't have a photometer to measure lux accurately. The reason I chose these over CFL was because in the specs these came out as being more efficient. The 85W CFL only outputs something like 5500 Lumen, where the cool white LED gives off 9000! If you check out the photos on the first page then you can see that the penetration and brightness of the LEDs does indeed look better than the CFLs, despite the similar wattages.
Overall, I'm inclined to believe that I am getting round about 9000 lumens out of my LED, giving 107 lm/W. Large degree of error either way though.
My main reason for going with these LEDs is that I prefer the wide-band spectrum over the narrow band monochromatic LED grow lights that have become so popular. I've always thought that using a selection of very narrow frequencies will end up creating a sort of bottleneck in the photosynthesis process. My guess is that plants are more used to wide-band light, so will likely be best adapted for that sort of light. Just a theory, but I'm happy enough with the result of my experiment so far anyway.
Last edited by MajorCoco; 04-14-2012 at 12:33 PM.
Looking great. I'll be lurking around. Best LED grow I've seen so far was a guy with a DIY 50w system of 50/50 warm white/cool white. Been thinking I need to do the same.
Completely agree with the wide spectrum > narrow band.
Good to hear someone else has done well with a similar sounding small rig. I have high hopes at the moment. Were they organic too? I'm planning on sticking to worm tea from now anyway. That stuff seems to be doing the business!
I gotta agree also on your synopsis about wide spectrum.....seems to be working quite well for you..
I have now added the CFLs back, but then my grow space has had to expand to fit my bushy ladies, so it all still works out.
Although I understand your point, that an even spread of light is preferable two point sources, I quite like the penetration that the arrays provide, and I really love the fact that they are each only 5" in diameter. In the confined space of my closet grow, these LEDs are much more flexible than a single panel would be. I can move each around, and raise and lower them independently as required.
If each individual 3W LED in a grow panel could be moved up or down with the canopy then I'd value their even coverage more...but in my current grow I think it would be really hard to light the bottom of my largest plant with a 85W panel of 3W LEDs at a fixed height above it. As it is, I have 2 lights at staggered heights, so the light nearest to the smallest plants' canopy also lights the bottom of the larger plant. (If you know what I mean..I'm probably explaining this badly)
If I get good yield and quality of this grow then I might start building and selling these lights man. I love them because they're so easy to use, mainly because they're so compact and neat. If I can be bothered post-harvest!!