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None of us have the machinery to do this and it would cost an arm and a leg, but............................ 1) mask heatsink for led thermal pads. 2) electroplate hs so all the pads are gold. 3) lay down a layer of teflon or some other suitable high heat electrically insulating material. 4)...

You're on the right trail....."stress, wasted energy" (Think snow blind as well) Like I said, it's going to take me a while to Carl Sagan-ize the concept so it is a simple easy to read hypothesis/proof.

repuk, pick your heat sink first and use drill and tap not epoxy. Post the specs of the heatsink to my thread and I'll do all the calcs for you and give you my 2 pence. I'll measure the XM-L's tonight, but they fit the same pattern as the XP-E's.

Even on the simplest level this is not easy for me to explain in understandable english. I am looking at this from a physics/energy management, density point of view and how us humans deal with harnessing the known spectrum of energy and drawing some analogies. It's going to take me a few days...

Aluminum glues like shit!! Epoxy hardens with age. The difference in expansion coefficients will crack the epoxy after time. (heat cycles) Better idea? gold electroplating then mask, then solder to the gold. Wire up over the mask. Could get much fancier if you want.

Maybe the wave form has just as much importance as the spectrum?

That is exactly what I was looking for. Thank you so much! So if I may, let me sum it up this way. Both sets of plants are about the same size, but they show different characteristics or morphology?

K.I.S.S Maybe shotgun method??? http://www.cree.com/led-components-and-modules/products/xlamp/discrete-directional/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXPE2.pdf There are 7 different flavors of white here. Why not just sweep the band in a number of...

Which ones are doing better, in your opinion? They look about the same from the pics.

Yum yum. Going to have to order some samples and get them on to stars.

Yup, growing in any type of water culture (NFT DWC) is for the extremely experienced. I thought that was the way to go too, but a year of semi failures made me switch to ebb and flow.

A pro grow 260 will fit the bill nicely. If you are not in the USA, I would find a local equivalent. It looks like there may be some support issues with them. I have a 260 and a 180. They have worked flawlessly for about 8 months of 12/12 and the 260 covers a 2x3 fairly well. Good luck!!

5-10 mil gal. Google root aphids and read.......alot!!

Here, I'll give you a marker. After about 30 runs, sog ala AL.B.Fuct. I get typically 10-15g per plant sometimes more, sometimes less.

I don't have or remember the voltage/current curve for your leds, but as log as the voltages and ma. line up, you should be good to go. I'm sure you read some of the links, they will give you the calcs to figure everything out. I hope you don't become a statistic of social Darwinism.:hug:

That'll work for 4 of those 10w leds at about 2v each. "transformer"??? or wall wart?? If it's a transformer, you'll need a full wave rectifier and some caps.

Yuppers, now the question is where are you going to get 3A of 30V DC to plug into the wall? 3A x 30v=90w

You could do it that way as an experiment. It's not very efficient and will get hot. For the lazy. http://reefledlights.com/how-to-diy-led/driver-faqs/ These things can get really fancy if you are willing to put in the time.

On my bell pepper plant.

Prey tell sailor, where does one purchase said crappy leds at a really good price? (and no name drivers) Thanks in advance.