Blinker 555 Pinball LED
This is a direct replacement for any 555 base bulb. These blink periodically to mimic the old effect from the backboxes in many 1990s Bally/Williams pinball machines. These will work anywhere and blink periodically. They are a cool white color.
Note: make sure on williams games to disable "allow dim GI" (setting 25) and GI Power Savings (Setting 29) if you want the bulbs to continue to blink. When the GI power is lowered, the blinkers will pause and will resume again when they get full power.