The Daewoo Lanos brake light utilizes a P21/5W bulb size for the rear lighting system. Data for the specified component covers the period from 1999 through 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Daewoo Lanos uses two distinct bulb types across its brake lighting system for the 1999-2002 model years: P21/5W for the brake lights and P21W for the center high mount stop light.
The P21/5W is a dual-filament bulb operating at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base. The dual-filament design allows a single bulb to serve two functions, typically combining brake and tail light operation.
The P21W is a single-filament bulb operating at 12V at 21W, mounted on a BA15s bayonet base. Its sole filament is dedicated to one lighting function, which in this application is the center high mount stop light.
Both bulb types follow the ECE standard, indicating they are designed for European and international markets rather than SAE-specification North American lighting standards.
The BAY15d base of the P21/5W and the BA15s base of the P21W are not interchangeable. The BAY15d base features offset pins to ensure correct polarity orientation for dual-filament operation, while the BA15s base uses a single-contact design suited to single-filament bulbs.
Because the P21/5W and P21W share the same 15mm bayonet collar size, physical fitment into a similarly sized socket may be possible, but the differing pin configurations and filament counts make substitution between the two types electrically incompatible.