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Very interesting input - thank you Supra. In Europe, I did not find any retailer for cxb3590 high bin under 60€/piece. KB on Ali asks for $50+shipment, which mean Citizen is actually cheaper for me. Yet your low power efficiency results let me wonder if Citizen CLU046 would not be the ultimate...

+1 airflow tend to be rather bad on server heatsinks. BUT if you use a blower type fan, or a high pressure one, you can achieve decent performances.

Actually, the heat producing part - the LES - is only 32.8mm diameter. Still a bit larger, but could work. There is a SurpaSPL post in the heatsink thread about intel stock coolers, which turn out to be quite effective.

Does anyone know a good retailer in europe for this type of track lights: I've been working chinese resellers on ali for a week now, and transportation costs are just prohibitive. After all, we need only the empty case, including reflector an track adapter, and make very convenient heatsinks...

Those seem to be 100W heatsinks. Way overpriced if you ask me. Intel core2 stock cooler are much better, and you can get them for next to nothing. (http://www.frostytech.com/articleview.cfm?articleID=2132)

Thank you for worrying about my alphabetisation level ;) Actually, my plan would be to feed those COB some 50-60W max, and see if I can break the cree cxb efficiency chart... I have no Idea how I would cool 365W in my kitchen. EDIT: http://www.zalman.com/global/product/Product_Read.php?Idx=416...

Check the docu. Max power for the citizen cob is 365w!

5000k - They give you 5€ discount if you take 5! http://www.tme.eu/en/details/clu056-1825c1503m2/white-power-leds-cob/citizen/clu056-1825c1-503m2g2/ 3000k - exactly the same price. http://www.tme.eu/en/details/clu056-1825c130al7/white-power-leds-cob/citizen/clu056-1825c1-30al7g4/

Stumbled over those: http://ce.citizen.co.jp/productse/info.php?no=78 Check out the largest model: CLU056: 32.8mm LES, 19k lumens @115W! http://ce.citizen.co.jp/lighting_led/dl_data/datasheet/en/COB_4/CLU056-1825C1_P3086_0415.pdf Would really like some "expert" opinion on this one. It's only...

How about fischer heatsinks ? A couple of years ago, they send me a huge heatsink for free, as sample!

http://www.mouser.de/Search/Refine.aspx?Keyword=cxm-32 EUR prices. Don't know why they put the warning "end of life" - it's a brand new product.

IIRC, there is not a single line in the Bible about weed. Humanist religions will promote individual freedom and personal responsibility, which also applies to drug consumption. Other will probably condemn both, for the sake of interdiction - but who would listen to 'hem anyway...

Just stumbled over these: http://www.luminus.com/products/cobarrays.html The Xnova cxm-32 looks like a beast! Anyone tried it ?

Ok, we have cree xlamps or bridgelux vero proven to be suitable for grow, whatever colour temperature you're into. My questions would be: what abouts others brands ? Has any of you tried osram or lumiled cobs ? An how about japanese stuff: sharp, citizen, nichia, toyonia. Some time ago, the net...

This is great! A couple of years ago, when I first read about leds, people would target 30-40%... What reds are you using ? Osram Olson or Cree XP-E (or anything else) ?

High efficentwatt, I'm very interested in your search, and also like keeping things simple. How about going with high cbx temps, like 5000k or 5700k top bin cbos + reds, or even 6500k; wouldn't this eliminate the needs for deep blues ? Although not a marijuana grower, I'm very interested into a...

Do you have a link to one of those monos ? I'm quite interested in this setup.

Can you translate for the noob I'm am ? 60% efficiency (I guess) by running 5000k cxbs soft - and what about red ?

Thank you for the clarifications; makes a lot of sense put this way. I'm very interested into 4000k or higher, as the light looks much better. Until now, I though it would be too much waste on the greens, on to little power on the reds, but if there are convincing tests proving it works, it...

Unfortunately, it looks like only 3000k won't be an option: this grow bench will be open in the kitchen and the lights used as (indirect) illumination. Since I'm planing a vertical kitchen garden (against a wall), I'm considering tracking lights. Has anyone some experience with it ? Those look...