Thanks Jeff. I was looking at the specs on the leds and noticing the difference in light output and angle. 12v is wrong. 1210 with the two pad package are 3.0-3.6v typically. I'm not sure how to measure the applied voltage to the diode. I don't think I'm able to with a multimeter unless ..maybe a resistor?

Either way, what I'm thinking about doing is finding a JY cluster and replacing a single led to see if it illuminates. I'm fairly certain it will, but one is easy to swap back. I'll update once time and money allow.

Any other tips are appreciated. Especially, if anyone's done a GP before. Thanks.