Bulb information

All bulbs have letters and numbers stamped on the bulb which indicate the power consumed by bulb operation at the nominal operating voltage.

For instance, in a 12V / 21W bulb the filament will consume 21 watts of power when 12 volts is applied across the filament.

While the wattage is not necessarily an indication of light output, it can be generally assumed that the higher the wattage, the greater the light output will be.

The common bulbs used in an automobiles are:

• Feston bulds used in many interior lights
• Bayonet connectors used in circuits lighting for park lamps; stop lamps; tail lamps; number plate lamps; some early headlamps.
• Wedge blub use in many dash clusters
• LED high intensity Wedge Bulb used in turn signals,side marker lights,parking lights, interior, and accessories

Source: CDX Global