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Kessil looks very, very good. I love their tech, I just wish I didn't have to pay $2.80 per Watt for it. Illumitex seems similar to me, but again, is prohibitively expensive imo. Glad you like the lights. Hopefully there's a huge sale someday and I can pick one up.

The glass lenses these multichips use will absorb a lot of light, they are so thick. Because of this their efficiency isn't the best.

Just because a COB/multichip is 10W doesn't mean it's a single 10W chip. To say larger chips are less efficient because a 3W isn't as efficient as a 1W, therefore COB's aren't as efficient as 1W LED's, is flawed logic upon flawed logic if you ask me. A lot of COB's use 1W chips anyway, and to my...

COB's and multichips don't have primary optics. Their viewing angles are ginormous. A potential benefit to the Cree lights on eBay that have like 10 in series. The Cree chips have 120 degree viewing angles (which is still large, but not 180 degrees). From what I've seen, most COB's and...

Never noticed leaves drooping like you describe. I don't ever dim my lights, though. Can't say I remember leaves doing this in any of my outdoor grows, either, say, on a particularly cloudy day, but perhaps those are my keen observational skills not at work. Curved leaves and downward tips like...

Poor Mud. She's laggin' behind. :cry: Everyone else looks great, though. Hard to tell how much room you've got left vertically -and I can't wait for the flip- but I just wanna see the girls get biggggger. I love those lower branches pokin' their heads out. Pet was talking about the yellowing...

Looks nice. I'd try to rearrange the bulbs a little, though. Put the Blue on top so the plants reach straight up and orient the Cree more sideways (or use a reflector) because the LED's are facing outward. <<< Click to see what I mean. If you see bleaching from the Blue trying moving the...

150cm^2 can be covered by like 10 Watts, that's a typo, I'm sure. 600W HPS covers 3'x3' or 4'x4' well. Two 600W HPS aim for 3'x6'. Eighteen plants in this space is a little tight, imo. How big do you want the plants? How much space do you have to grow? -Edit- You mean a 5'x5'! >.< My bad. Two...

http://beijingyuji.en.alibaba.com/product/1052904972-213442539/19W_LED_Tube_Light_High_CRI_up_to_98_Ra.html No, we can't say either is "better" for growing -I can't even tell if the tubes are using a Violet pump like some of their other products- but like I mentioned they are ~95CRI with a...

Starting to get sugary. Closeup of same image.

Is that remote phosphor? Why is the phosphor layer so huge? Have you heard of these guys? http://www.yujiintl.com/high-cri-led-lighting They have some stuff on Alibaba that I saw (high CRI LED tubes). I think they make LED lights in a lot of different formats/footprints and all seem to have...

Don't we already know that light quality can change the pigment concentrations of plants? I.e. why do plants grown under Red:Blue LED's have dark, forest green colored leaves? Aren't their leaves thicker also? Wouldn't the experiment show vastly different results even with clones of the same...

:shock: It looks pretty damn impressive from here...

As discussed in the paper, couldn't V-C-F be fooled just as CFL (and now LED) manufacturers cater phosphor mixtures to the CRI standard? Just because a light has a respectable looking V-C-F doesn't necessarily mean it hits photosynthetic efficiency peaks very well at all. It's similar to how an...

I got "electrocuted" by my Cree driver once while I was making my Cree-bulb panel. I had always planned on insulating any bare wires, though, and ever since I did it's been a non issue. I have a feeling once you encase the driver and insulate the wires going to the mcpcb you'd have to almost try...

Interesting concept, imo. One thing that can't really be taken into account, though, is plant species and desired photo morphology of the plant. Not everyone wants, or can deal with tall indoor plants. But, assuming we wanted plants that looked and behaved as similarly to outdoor plants as...

The heated glass can shave off the protective silicone and phosphor if you're not careful. The California rebate has a CRI stipulation that the standard Cree bulbs don't meet. My guess is no.

It's the same LED just driven harder, correct? If you take the glass off both bulbs you're paying about 10 cents more per Watt. I'd go with the cheaper solution. I want 90+ CRI, but not by throwing energy away...

Holy shit. 93 CRI... -edit- Oh, they're filtering out Yellow light. Nvm. Still kinda cool, I guess.

e27 socket = screws into an ordinary light bulb socket you have in your house 146 LED = it uses very low wattage LED's, not the best efficiency Red/Blue spectrum = Probably ~450nm and ~660nm to hit photosynthetic efficiency peaks would they work = Yes, but to what extent? I recommend saving your...