from FB comment in Vintage Transistor Radios
Pablo E. Laredo
I used to buy LEDs from small vendors on eBay. I found that most of the 5mm LEDs that I got from the small vendors were seconds, the chip wasn’t centered so the beam was off center, or there were bubbles in the clear epoxy which caused a diffused beam. Both of these problems can be seen if not with the naked eye, with a small magnifying glass. I got a refund from a few vendors and I stopped buying them. Then I found the LEDs from vendors in China had very few problems.
