Quoted from Pinballer22:From the pictures of the actual bulb it looks like they are the style that only work if inserted the correct direction like previous 555 PBL leds...can anyone confirm?
That is one of the biggest reasons CT leds are nice...throw in the 555 with the machine off and know it will work, not so much with the PBL ones of the past.
All PBL LED lamps are AC/DC (unpolarized) except for the cheapest 1-LED lamps.