Bulb TypeT20 (Wedge Base)
ANSI/SAE Designations7440, 7443, 7444, W21W, W21/5W
Voltage12V (some variants 12V/24V)
Wattage (Halogen Reference)21W (single-filament) or 21W/5W (dual-filament)
LED Wattage (Typical)1.7W to 10.5W
Light Color (Typical LED)White (6000K–6500K), Amber, or Clear
LED TechnologySMD 2835, 3030, 5050, or 1206
Lumen Output (Typical LED)240–600 lm
Lifespan (LED)30,000–50,000 hours (up to 12 years)
Base SocketW3X16Q or W3X16S (Wedge)
Physical Diameter20 mm
Typical ApplicationsBrake lights, turn signals, reverse lights, daytime running lights, tail lights