I'm currently using these...............
When I can keep the mono's from blowing(not from heat,BTW), I'm comfortably running 200W on each 1M length of the wider profile, BUT, be warned, they ARE heavy.
EDIT......these are passive, but my ambient room temp never rises above 80deg and I've got 2 'room' fans, including the one in the picture blowing 24/7
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