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Did you have a specific reason in mind,?

great explain

Flicked through the datasheet, these bits stick out a) 90lm/W b) 92cri the spectral graph looked like a big peak 410 and 460. Not sure about the working range, cree also outline some rigorous test procedures, -40c -- +80c . Its not really worth worrying about as your environment shouldn't...

OR SDS.

If I put a massive chunk of aluminium or cooper in my grow room/ big volume,/ small surface area/ (opposite to heatsink) say, 1-2" tall and the same footprint as my box. (and put it under pots) In theory it would absorb heat during lights on, and release heat during lights off.- YEa Nice...

That driver has a max Vo of 36V. Reading back the last 5 posts it would appear you are strongly urged to run COBS in series. This makes your driver only suitable for 1 cob.

tidy mate.

These are brillant, so many flavours to choose from; Have you or anyone else made an order yet? I've sent an enquiry as I'm in europe. Thanks guys! This forum is ace :D

SDS you're a hero. You are an ambassador to the global cannabis community, people should endevour to be more like you. (PDF's)

Sorry sds, I was rushing. My reply was not constructed and I feel a bit embarrassed to make such a post given the effort you have put into yours. How do you maintain a healthy curious mind vs smoking pot. :P

Given your understanding of plant biology and COB's can we still say that aiming for 50w/sq ft is a suitable target for led based lighting

http://sound.westhost.com/heatsinks.htm

Thanks Cozz, Unfortunately my plants haven't had a good up brining, cloned, and put it into a pot that was possibly too big. left in kitchen under t8 for 4 weeks while I made a grow room. Looked good in veg but at the switch leaves are yellowing and growth is small stunted. etc.. I'm...

My plant is not looking healthy, anyway, I decided to re pot and...... The roots were surrounding the perimeter of the compost ball (bit root bound), but there didnt appear to be many roots at all in the centre of the compost ball. Is this normal for healthy or unhealthy plants? thanks, UKP

thanks supra, so we want the cob as cold as possible (within reason) ? the colder the Tc the less Vf is reduced. the less Vf is reduced the more current flow through the chip, and so more light output ? ffs why is this so complicated for me to understand! :(

Something I don't understand about this is that the higher ambient temp shows a reduced voltage for the same current, but I always thought the light output was dependent on current, and as temps fell so did voltage. I've got mixed up somewhere, cann anyone straighten me out?

http://www.uk420.com/boards/index.php?showtopic=354349&page=7 check that out if you want a view of another fourms perspective on LED vs HPS. starts at page4. interesting points interspersed with stupid comments!

Ah cmon guys, Out of 7 replies 1 was valid. Imagine all the energy that is wasted in servers because of all the unnecessary posts made.... :P

I had a hunch all these supposed constant current sources were actually constant voltage sources. Thanks for clearing that up.

Supra? GreenGenes? SDS? ChurchHaze?