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Thanks again dude! I will go with; 4 x cxb3070 @ 700mA 2 x drivers 4 passive sinks @ 30W max each. Will update when I have started buying, few months kind regards, thanks for your help etc.. UK PEANUTS

What leds are you running? was 65% a typo?! I was considering some individual passive heatsinks for cooling cxb3070 @ 700mA. Consulting your excel sheet (ty) I see that they are dissipating 24W of heat @ 700mA.. 6" of 5.88 profile gives you ~ (6*260)/75) = 20W cooling. there still cool...

@SupraSPL -- A while ago you mentioned you were going to try passive cooling some 25W COBS using a 6" length of the 5.82 HUSA profile. How did you get on with that? Any news? thanks, ukp

TL:DR?

What size room are you using doer?

Yea, I had a hard time when i was trying. Old 400W bay fittings used it, maybe a few of those on ebay? spares or repairs?

Also got a few quotes from BAL last week. http://www.bal-group.com/heatsink_detail/195 -- 1070---- £45 / M http://www.bal-group.com/heatsink_detail/48 -- 1160 -- £52 / M

Yea Doer, I suppose you are right, I was thinking small scale. @bicit - I have built 2 shades using those drawings, I scaled them up (cad or paint, I can't remember know) and got them printed at 1:1 scale by a printing shop in town. I found them originally on a tropical reef forum a few...

Couldn't you just buy some 0.7 or 1mm sheet and dent it lightly with a ball pien hammer. its cheap and it doesnt take long.

Bro. Just do some reading, otherwise you will be flamed, and we will enjoy it. I hope to see you posting valid questions and successful grow pics in the near future. Best of luck dude :) if your really stuck, read some more :P

I was really impressed with DigiKey. Fast shipping, best customer support I've ever had, and I've been on customer support alot.

http://www.gzkaisen.com/en/disproduct.asp?fid=27&id=292 KLA-120 The Internet of things series -- that suggests I can talk to it via, ethernet or wirelessly. that would be really neat.

1M of that heatsink profile was about £60 when I enquired

thanks

@Doer // I get the safety margin. Apart from the way I set about, how would you suggest calculating the total surface area for the heatsink I posted above? I totally forgot the baseplate. (i'm gonna call that my safety margin :P )

I don't think I included the small horizontal area between fins, are you sure I got it right? (ty if you did the maths)

Can someone check my work please, I think its right because the total surface area per unit length is similar to that of the 5.88" HUSA profile. -- Edit: I actually think the area is too small because I didnt add in the horizontal area between fins, If someone could check that would be great...

Thats all well a good, but you can't order from there yet. I sent an enquiry to the email addresses a week ago but I'm still awaiting a response.

http://aceleds.com/admin/uploads/ac-150cd1-5abz_catalogspec.pdf few more like it with diff Vo Io I'm trying to find something suitable for 2 x vero29. @ 1400mA .. thisbest I've found so far.

Ca I put a cree3070 in series with a vero 29? I should be able to, right? but id like some confirm before doing it all the same lol thanks,