The problem is I think I may have gotten a second from Fasttech. Pics of both arrays
I hooked each of them up to a variable power supply until the LED’s just started to light up. First the 2530 from FT
Notice there are 2 rows of emitters that do not light up. As I increase the voltage they still do not turn on. 2 rows of dead emitters! There are 2 rows there not lighting up. Here is a shot of those emitters illuminated from behind with my SK68
The larger 3590 however, acts differently. Almost all but not every one begins to turn on at the lowest voltages but even out as the voltage is increased.
Each emitter in the array, or serial string of emitters in the array (depending on how the array is internally configured) will usually have a slightly different forward voltage. So the lowest vF emitters in the array will illuminate first. Sorry to hear about your 2530.
I noticed my 3590 was about the same with just barely powering it and low voltage. +1 on what FlashPilot said. They all evened out once voltage and amperage got closer to spec.
The 2530 from FT is about $10. That is a fantastic price for a 65W LED, upwards of 5700 Lumen. I am wondering if they are selling seconds. DigiKey and Mouser charge a lot more
I see the pictures of the tiny emitters on the 3590 lighting up separately, and can’t help but think how cool it would be if each of the emitters was able to be individually accessed. Tiny little Cree dot matrix display
Sucks about the 2530. Have you sent the picture to FT?
I understand what FP and OL are saying about the 3590. I expected that. What is curious to me is that all of the LEDs that do light up on the 2530, light up evenly. Even at the very lowest of voltages.