I have 8 of these and they arent driven at 10W. I did Relics resistor mod to bring the drivers up to 1A output (post 33). I also heat sinked the driver diodes to the driver housings to prevent them from frying themselves. Leaving them turned on outside for an hour @ 65 degree F ambient temps yielded a very warm light. Any more wattage and it would have been to hot to pickup. I also have a 10 pack of warm white emitters to swap in… some day.
I have a 24V power supply to convert to XM-L later, but then they would all have to be series wired in a string of 8.