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Nomo, That's half the point. Highest electric efficiency for best price. It won't always win. If you put a 1000watt actual draw high end light vs 5 190watt actual draw Chinese panels I bet they'd win because they could be kept closer and spread more evenly over the canopy.

Except how long is veg? How many watts per sqft? And I've seen the diy cobs doing only 0.8-1gpw too in some grows. I don't agree with nomo on reason 2 but I do agree that diy vs purchasing isn't a good comparison as building 60 cobs would such.

But at what cost? Most of you are doing small grows from what I can see and if you can spend $300 on 3 lights vs 1200 on one light and hit 1gpw vs 1.2gpw how long will your investment take to pay you back? Will the rewards keep up with technology? Are they that much more inefficient? Are...

I know what you're saying.. If the lights produce light more efficiently, the plants used it just as effectively, and distribution was just as good then the better diodes would be a win. But when you are looking at costs of the unit compared to the actual performance you're all getting...

"I see no difference in distribution of light. Yes, even highly efficient lights can be spread well." LEDs tend to have a maximum beam angle of 120 degrees. This means that the light extends 60 degrees to either side at which point half of its PAR is already lost as heat. Now think about it...

"BUT you get the job done (photosynthesis) with much less dissipation by running them at high efficiency, so there will be a lot less heat in the system." Only if the plant can use the light before it dissipates to heat. I've not done tests and I don't grow or smoke pot but I enjoy scientific...

More lights allow more even spread which are more efficient than one light, preferably they would daisy chain themselves together

Also, I'm guessing that if you want to compare results with HID you probably need somewhere between 50-60 watts per square foot.. Do it with a bunch of small panels and you're utilizing the electricity much better than HID and will Watt for Watt get better results provided the lights are half...

Positivity, because you need to be measuring PAR, not lumens, and you need to compare the spread of light from one expensive one vs many cheaper ones. Also ensure that the expensive one doesn't provide wasted light to the center by exceeding the plants capacity.. Can be as efficient as you...

Ace, as I said, light takes time to dissipate as heat and also microwaves heat from the inside out which makes them more efficient at heating things quickly. A microwave with the same energy as a stove will heat food faster

Nomo, sort of... Some of the light is absorbed by the plant and used in photosynthesis, and some stays in light for as it bounces around and maybe gets absorbed by the plant but yes the rest is heat. In fact, the reason lights lose intensity over distance is due to some being converted to...

The whole point was that you would end up with the same temp/light efficiency ...light not used by plants will turn to heat... Or the earth would be frozen.. Sunlight warms us. And as I said, if you test PAR it may be more efficient.. But you can get a 190 actual Watt led for $100 and put...

I'd be curious to see the difference in efficiency. To test.. Build a 3 or 4 cubic foot box from 2" xps, whichever size fits both your lights, and seal corners with silver hvac tape. Put your light inside with a thermometer and cut a small notch for the cord. Put another piece of xps...

Guys, come on, let's just pray to God to give us the answer and ultimate lighting system. Ask and you shall receive, in Jesus name, amen. </sarcasm> The way I see it is you've got to pick a side and just have faith in the spirits of your lighting system, because as of now the...

I still want to see PAR comparisons. I think a lot of people say LED is worse because they're comparing a 600 watt hps to a 600 watt LED that only draws 250. I also don't buy the white LED theory, yes I understand in sunlight that green is used up much more than a photosynthesis chart shows...

I don't have the study on hand but at about 80 degrees and 1200ppm the government found cannabis could only handle 2000 Einstein. I also recall hearing plants can run better in the mid 90s, but I'm not sure on this, and there was skepticism on affect on yield, I believe ed Rosenthal was part...

I can't support any side, but lumens aren't used by plants, PAR is, and it's measured in einsteins, also.. It's pointless if you exceed what the plant can handle over a given area at that point.

To do this correctly you should.. Mount the fan on the inside of a rafter between the joists (if it fits, if not mount it on top of the joist) Then build a box out of 2" XPS insulation and the silver HVAC tape to fit over the fan (much simpler if it fits between the joists) so that the bottom...

No. Hot, humid air in the attic = mold. If you would like to vent through your attic then install a roof vent like this: http://www.homedepot.com/p/Speedi-Products-6-in-Black-Galvanized-Flush-Roof-Cap-with-Removable-Screen-Backdraft-Damper-6-in-Collar-EX-RCGC-06/202907395 Also, ensure you use...

OK well I can't find the link to the study but I read a government report where under red/blue LEDs cannabis saturation was at 2000 Einstein but they only took co2 up to 1200ppm if I recall and temperature up to 30 degrees Celsius or something around that.