This is an apparently failed LED from a 5-year-old Nuevo (HGH0242) / Horizon Lighting 5-pendant light fixture in my house. Only this one has failed - all others still work. It measures about 11.7 mm wide, 14.5 mm long. The aluminum (?) coupon it is mounted on is about 1mm thick and the LED protrudes about 0.7mm above that. Note that it is essentially a lens-less flat disc, not a hemi-sphere. My guess is that color is about 3000-3500K. The power supply, which still works (verified by powering other identical pendants), is rated for 350 mA (constant current), 12 W, 21-36Vdc. This power supply powers two of these pendants in series. The other (different) power supply powers the other three. It appears that the number "3713" and "+" and "-" marks are shown in the solder mask. An ohm meter shows an open circuit across the part. The series string of two pendants fails when this one was in it and lights when I substitute another identical pendant for this one. I've tried the big-3 suppliers without success and my Google-Fu has failed me. I'm trying to replace just this one instead of having to perform surgery on all 5 of the pendants in the (expensive) fixture so they all match in color and brightness. TIA for any help.
You need to find a COB LED (Chip on board Led), 350 mA, with a voltage range of 10-18 Vdc, more or less 5W. More or less 600 lm. The number of lumens can be very different, it's just an estimate for 120lm/W. It can be as low as 300lm. But it helps narrow the search.
The voltage of the LED is equal to the voltage of the power supply divided by the number of LEDs in series. (Check if there are really in series). It's important that it matches the voltage range. The voltage range can be more or less 2V for the lower and the upper limit and can be narrower than what I wrote.