I used mostly steveleds for my build back in the day. I went with the tube style heat sink as well, mainly for hopes of a lower profile and quieter fans. It all preformed ok but the fans pretty much always had to be on to keep temperatures within allowable and they weren't that quiet. If I would build again I'd use either standard heat sink or u-channel. I would definitely say the tube style is less effective.
The Luxeon RBs use to be considered somewhat better than the crees but I'm not sure that's still the case, haven't kept up with the latest trends. The advantage was a lower spectrum peak so potentially better for color I guess.
I pretty much bought everything that guy sells and I'm not using any of it, lots of stuff never even used. If there's something you need or want to try out shoot me a PM. I have the fans for tube heat sinks, all the LEDs in most colors, drivers, 0-10V adapters and so on.
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