Originally Posted by
znomit
I don't know about that "bulb" specifically but common Cree LEDs are rated at 5v reverse.
Dynos can put out 100v.
Indeed, from what I see, the high-current LEDs have low breakdown voltages, albeit higher than driving voltages. The consumer replacement bulbs typically, though, again from what I see, have a protection against reverse polarization. Otherwise for Schmidt to produce over 100V, you need to ride at 160 km/h having a connected load of 10 MOhm.