Originally Posted by Robbie1990
got another question for you hoppy,
I am going to be running 2 rows of xp-g led's on a freshwater setup
each row has 9 led's spread out over a 44" length. Led's will be ran at about 750mA so half power.
Will i be able to use some aluminium flat bar that i have lieng about for the heatsinks for each row or will i have to shell out for heatsinks?
led's are from ledgroupbuy so are 20mm base stars the flatbar is 6mm thick 40mm wide and as i say will be cut to 44" long with 9 leds on. i may also have some 50mm wide stuff
I don't think I would try to use thin flat aluminum bars as heatsinks for that high a current, even though it is half power. In order for the heatsinks to get rid of the heat they need enough surface area to transfer the heat to the air. Finned heatsinks give lots of surface area for that purpose. Aluminum channel extrusions add the surface area of the "legs", and the wider the heatsink the more basic surface area they have.