Search results

Just putting this out there in case there are any of my fellow countrymen after a good deal on some CXB3590 CD 72v COB and matching drivers. Check the link for the trade me auction and hit me up on here if you want to cut a deal for a better price than what I've got on the auction. These are...

not trying to be a dick bro but try running the numbers your self using the formula's we used a couple of pages back, its pretty easy. Come back with what you get and I'm sure the crew will tell ya if its not right.

Yea you can run can 8 CXB3590 36v on a HLG-185H-C700B, also the C700B has a external control that you attach a 100k potentiometer to so you can dimm the light. Check out this and this thread https://www.rollitup.org/t/matching-drivers-and-cobs.883866/

Cheers mate, you really need to be running a COB DiY school lol...if ya ever in New Zealand look me up man I got ya covered!!

Yea cheers bro, I just seen that. Its telling me 21 heat watts for a single CXB3590CD 72V @ 50W but I'm getting 28 Watts 50W x 0.56(efficiency) =28??? So if I'm correct the MF25 should run a that COB passive MF20 - (250 x 2) + (40 x 2 x 25) + (8 x 2) = 2516mm 251.6cm x 15.15cm = 3811.74cm...

haha nice could you hear the penny drop in my brain just then lol...cheers bro. just so I got this fully locked down, whats the formula to work out how many "heat watts" a COB will produce?

So are you saying we only need the correct amount of surface area in the heatsink to remove what the cob is producing in actual "heat watts" not what it producers in "light watts" ?

So can I take away from this a average of 700 PPFD played a good part in getting 1.47 gpw? Could this average of 700 be applied to any size grow?

might be splitting hairs but shouldn't fin height be 54? overall height(62mm) minus 8mm for the raiser?

Good question kinda of makes sense...SupraSPL???

http://www.conradheatsinks.com/products/flat100_350.html MF30 Perimeter = (300x2) + (40x2x30 ) + (8x2) = 3016 Perimeter = 301.6cm 301.6 x 15.15 fin length = 4569.24cm² 4569/120=38.07 Have I got this correct?

I'm getting 37.7 W passive for the MF30 and 43.95W passive for the MF35, still a bit short for my liking. I'm going to stick with putting some fans on the MF18.151. If they made them a bit longer I'd say we'd be in business

True? I haven't fully got my head round the formula for working that out. What formula are you using? I'll be running them at 50W

Cheers mate, thanks for clearing that up. Might have to use the 240 when it finally comes out

Ahhh so the C700 can only do 0.7A yea and if I wanted to run them harder I'd have to use the C1050?

I'm building a 6 CXB3590 72v COB modular actively cooled light with 2 HLG-185H-C700B ,So I like the idea of running COB's a little harder if i wish so am I right in thinking one HLG-185H-C700B could run 3 COB's at 1.05A? Each COB at 1.05A is pulling 71.94Vf x 3 =215.82Vf The C700B has max...

Safe as man, yea hopefully they can do meter lengths for you, the postage on those for me would prob be to much, the MF35 might be the go 350mm wide and has 8 mm base. haha know what ya mean I just dropped $700 on COB's and drivers alone but this will pay for its self the end and thats a...

Yea I'm just going for 6 COB at moment, Ullrich in NZ has nothing in stock that will passively cool and you need to buy 250kg worth for them to make any of the out of stock profiles. I was wanting to do a passive cooled system as well but as I can't get anything at a cost effective price...

yea none of what they have in stock at the moment is any good for using with cob's, well for what i want to build any way. Looks like Conrad heat sinks in Australia are my best bet. Gave me really good price. Have you done build?

Cheers bro, much respect!!!