Lighting Heat sink help

[Ivean]

Does anyone know if this heatsink http://www.ebay.co.uk/itm/252559707114?var=551470191584
would be capable of running upto 5 citizen clu048 cobs at 50w each?
Obviously im thinking id need the 1.2m long one for passive cooling?

 

[KonopCh]

For passive? No.
And this heatsink is not big enough (base thickness and fin height).

 

[Ivean]

Bugger. Thanks for your help
I'll keep looking

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[2Stoned2Care]

Here bro this is what i got for 4 1212s you can pick any length http://www.ebay.co.uk/itm/Aluminum-...hash=item1ea01e42d1:m:mUmeObwN4TYRKRW3C5qYtlQ

 

[Ivean]

Here bro this is what i got for 4 1212s you can pick any length http://www.ebay.co.uk/itm/Aluminum-...hash=item1ea01e42d1:m:mUmeObwN4TYRKRW3C5qYtlQ

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View attachment 698957

What length are you using for 4 ?
That looks pretty much the best I can do until I can afford the more expensive individual pin fin heatsink

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[2Stoned2Care]

What length are you using for 4 ?
That looks pretty much the best I can do until I can afford the more expensive individual pin fin heatsink

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Hi bro thats a 40cm one but i think the cobs are to close together so i think i am going to get a 80cm heatsink to spread them out more

 

[Ivean]

Perfect I was thinking of the 1m one for 5 cobs so same sort of size.
Top man cheers for the help

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[woody]

I wonder if a 1meter one would run four cobs passive? Anyone know

 

[2Stoned2Care]

I wonder if a 1meter one would run four cobs passive? Anyone know

It probably would sang but with just 1 120mm fan in the center you would have no heat hardly at all.my heat sink never goes above 80F so not even warm really,with passive your just creating more heat in the grow room.i would rather have to add a heater than try and get rid of heat

 

[woody]

Fair point mate. Im just being lazy and trying to keep any wiring to a minimum!
Im picturing your set up done twice with some aluminium angle to hold them together with a 6-8 inch gap in between- would also mount drivers there