Life is around 50,000 hours - more than your car!!
They can suffer from getting hot at times and fail but rarely if this is within 6 months then I offer FOC replacements. Light colour wil be bright white with a bluey tint at times.
As for fitting depends on what car you have, if you have ac/climate or none, size of hands and knuckles and how much patience you got...........
Cheers
C