High Power 10W Cool White LED - A+ GRADE - 10uA Matched

Details

This is a "10 Watt" High Power LED - COOL WHITE (see other listings for warm).

3x3 die arrangement, forward voltage 10-11v, max recommended current about 900mA.

This particular batch of leds has all the die almost perfectly matched and starting to light at approximately 10uA (10 microamps), and so I have personally graded these as "A+", the best you are ever likely to see in terms of matched die.  

Opinion differs on the importance of matched dies, but especially if you will be using any sort of dimming a better-matched LED is going to give better results. My standard grade of 10W led are tested at 150 mA (150000 uA) these have been tested at just 10 uA.

STOP! High power LEDs must be current limited* or driven with a constant current supply and must be attached to a fairly substantial heatsink Do not simply attach to a "10v" (or even higher) supply, your LED would be most likely destroyed instantly. (* Yes I know this is a generalisation)

All high power LEDs produce a LOT of heat. Do not even think about running it without a heatsink for more than a second. I typically look for a rise-above-ambient of no more than 45 degrees measured at the LED tabs when stabilised, of course, the colder you can run them, the more reliable and longer-lived they will be.

A typical old Pentium-4 style heatsink can just-get-away with passively cooling a 10W led attached with heatsink tape.

Smaller heatsinks can be used if you actively cool them (heatsink with fan).