🚀 go-pugleaf

 > >>This is the low beam from a car with four rectangular headlights.
 > >>The light is rated for about 200 hours at 14 volts.  
 
 > >I find that hard to believe....
 
 > Keep in mind that it's at 14 volts, not the nominal 12 volts.
 
Another, and much bigger concern is the effect of vibration and how
well filtered the current is going to the bulb.  Vibration is muuch
worse on a 4 cyl car than a 6 or 8, plus the voltage from the
alternator  often pulses much worse on these cars due to various
factors such as the much smaller battery, etc.  Pure battery driven DC
will extend bulb life on a bike (although road shock negates this
horribly) while a good 8cyl engine with decent regulator tends to make
them last well too.  (the cadilac factor)  
 
The biggest point to consider in bulb life span is "when will it be the
worst time to burn out?"