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Yes, that metallic tape probably is a good idea. I went for an aluminium plate with wooden strips around it and a thin wooden plate on top. In the plate on top I have installed two slow rotating fans (less sound) and the heat is duckted away. But then again I use far more power (approx 100W) and the whole setup is only slightly larger than yours is. Without the fans the temp would quickly rise above 60 Celsius (then I start burning my hands)
See my reply to ThinkTinker, I use far more power. BTW, I have mixed red, blue and white leds.
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