Joe,
For your info an auto's regulator will normally charge in the 13.4 volt to 14.9 volt range and be considered perfectly safe for automotive work, sometimes due to an extreme load on the alternator it could be as low as 13.2 volts. New car batteries should be 12.6 volts when fully charged.
Most 12 volt bulbs can handle 18 volts for short periods of time.
A lower volt bulb will heat up faster than a higher volt bulb and can melt some softer plastics.
Lee F.
For your info an auto's regulator will normally charge in the 13.4 volt to 14.9 volt range and be considered perfectly safe for automotive work, sometimes due to an extreme load on the alternator it could be as low as 13.2 volts. New car batteries should be 12.6 volts when fully charged.
Most 12 volt bulbs can handle 18 volts for short periods of time.
A lower volt bulb will heat up faster than a higher volt bulb and can melt some softer plastics.
Lee F.