Automotive bulbs provide illumination for forward lighting, signal indication, and interior visibility. These components are utilized in headlamps, taillamps, turn signals, brake lights, and interior fixtures throughout the vehicle. Bulb technology ranges from traditional halogen and incandescent filaments to gas-discharge (HID/Xenon) and solid-state (LED) emitters. Key specifications include wattage, voltage, base type, and lumen output, dictating compatibility and performance. Modern bulbs increasingly incorporate features like color temperature (Kelvin) and beam pattern optimization for enhanced visibility and safety. Replacement requires adherence to manufacturer specifications to maintain optimal system function and regulatory compliance.