Also, have you handled one of those spotlights? They are much heavier than a standard spotlight bulb, So it goes back to weight and size. Scale that up to a full array and you end up with a large heavy heatsink if you want to go without fans.
Like it or not,if you want to run a larger array of 3W LEDs at or near full power without having a 50 pound light fixture you need fans.
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