Bulbs used in most other lighting fixtures fit into sockets and are held in place by spring tension or mechanical force.
Common type of automotive bulbs.
Bulbs are coded with numbers for replacement purposes. Bulbs with different code numbers might appear physically similar but have different wattage ratings.
There are two basic construction designs for exterior lights: those in which the lens is removed and then the bulb removed from the front, and those in which the light assembly must first be removed, then the socket from the back of the assembly, and finally the bulb from the socket.
- Removing the lens from the latter type assembly could cause serious damage to the reflector due to dust and other contaminants.
- Wiping the reflector surface to clean it can also seriously reduce the light's brightness. Therefore, do not remove the lens from light assemblies in which the socket and bulb are removed from the back of the assembly.
- The bulbs are held in their sockets in a number of ways.
- Some bulbs are simply pushed into and pulled out of their sockets, and some are screwed in and out.
- To release a bayonet-style bulb from its socket, the bulb is pressed in and turned counterclockwise.
- The blade-mount style is removed by pulling the bulb off the mounting tab, then turning the bulb and removing it from the retaining pin.
- To replace a bulb, remove the bulb accordingly from its socket, and insert a new bulb.