Led4power.com : LD-4 CC linear drivers, ILC-0/1 illuminated tailcaps, optics, MOSX, copper DTP MCPCBs...

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XP-E2? This test shows maximum at only 2A.

At 10Amps total LD-B4 is better option (in combination with mosled 4xp board) because its much larger heat dissipation capability.