If you have a bunch of identical ones, it wouldn't be too hard to use them. For instance, you could place them in a grid, and use a pair of 1x1s for each row to hold them, and also 1x1s to make a frame. use some glue or silicone to stick the heat sinks to the 1x1s.
But if you have a bunch of mismatched ones, like I colleceted from 4 different computers, it gets pretty challenging.
The ones I found are big enough and good enough that you would not need a fan for 1w or 3w LEDs, assuming you left them with free air circulating. I'm not sure about 10w.
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