Main reason: I bought a bunch when about a year ago to replace a bunch of lights on my Whirlwind. I spent an entire afternoon changing them out underneath the playfield for the inserts. Turned on the game and what do ya know...........when one feature lights up it lights up other feature lights. Nobody said anything to me about ghosting.........nor did I understand. I guess just a part of the learning process of this but extremely dissapointed that I needed to spend a bunch more money for non ghosting leds.