Originally Posted by
Ttaskmaster
I'd concur if the strip was attached directly to the U-channel, which actually does look like it'd work as a heatsink...
However, the strip appears to be glued to a metal bar (possibly aluminium), and that bar is then attached to the u-channel. So that's at least two layers of material between the strip and the heatsink, neither of which may be especially heat-conductive. Kinda hard to tell from just the photos, though...
Also, there are plenty of high powered LED strips these days that don't make use of heatsinks. There's a load inside our Klix vending machine, to the point where I'm considering half-inching 'em!