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Just some facts as we go along. Negative CRI? http://en.wikipedia.org/wiki/Color_rendering_index Numerically, the highest possible CRI is 100, for a Black body (incandescent lamps are effectively blackbodies), dropping to negative values for some light sources. Low-pressure sodium lighting...

Don't get offended. The rest is on us. :) We can help you. But, it is all a trade off. You can build a rig for the same price as commercial but better. Or you can build a commercial type design for cheaper. And I am with @Positivity. The market moves so fast, the commercial guys are...

Kingbrite carries the holders now? Cool! Maybe they will stock reflector knockoffs soon.

oh, don't let him troll you. he is just goofing. :)

That is some neat looking work there. All lined up perfect like. Attention to detail shows immediately. :)

Now that's a thought. Low-pressure sodium lamps—producing up to 180 lumens per watt—have the highest efficacy of all commercially available lighting sources. A low-pressure sodium lamp is shown in the image below. Low-pressure sodium lamps operate much like a fluorescent lamp and require...

Good thread. We agree. No best color temp, your mileage may vary. :)

They did the world a favor, I think. It is a vulnerability, and you have to know how to counter it on the street. As you hint, many punks think they just need to tackle you. But, my Wing Chun is 3D, I can punch hard just from my body mass as the breech block. I don't have to have my feet...

Well, you will be slightly more inefficient. I will run them in gangs of 4 at 700ma, each. I really was going to go your route. But, even though I defended my position forcefully, if rather in-artfully, I was soundly reconciled, into the Hazy Church of LED Goodness, after, what was it, 40...

Very good, sir. I appreciate your insights as usual. Thanks. :)

Oh, I know for sure, you are not saying that. You and I are very straightforward and I like plain talk. What I am asking, is at what level can I exceed a more conventional design and to do that I have to use water. So that is why I asked you. You have the knowledge in detail. So, I asked...

Read the paper.

Read the paper that was posted. Don't just look at the pictures. :)

I think there is mix up. I see it all the time. Stretch is not what we are seeing. That is growth rate. That is booming to be large. This is stretch.

Well, that not where I got it, heck posted it in the Tech section. But, thanks for the link. :)

You can find 21,000w grows on youtube.

If your plants are not out at night stalking stray cats for protein, open the window more wide. Set up a crawl ladder for them against the wall.

Oh wait, here it is. @heckler73 posted it. In the meantime, as I mull over the details, have a gander at this little gem I stumbled across: http://leds.hrt.msu.edu/assets/Meeting/Optimal-spectrum.pdf

Sure, man. I'm still looking for the link. Here are the pictures from the research paper I found, so the link can't be to far back from there.