Automotive LED bulb Amio P21W / PY21W (BAU15s) – dual-function daytime running light and amber turn signal

The Amio P21W / PY21W (BAU15s) LED bulb is a dual-function automotive lamp designed to serve as a daytime running light and an amber turn signal. Built to fit standard BAU15s sockets, this LED replacement provides consistent light output with lower power consumption and longer service life compared to conventional incandescent P21W/PY21W lamps. The bulb preserves the required amber signal color for turn indication while delivering white or daylight tones suitable for DRL applications.

Advantages

This Amio LED bulb combines two lighting functions in a single BAU15s-compatible unit, reducing the need for separate lamps. It consumes less electrical power than traditional bulbs and generates less heat, contributing to longer component life. The LED construction offers improved shock resistance and a longer operational lifespan, while maintaining clear amber signaling for turn indicators. Installation is straightforward in matching sockets without modification.

Suitable for

• Vehicles with BAU15s sockets requiring P21W/PY21W replacements
• Daytime running light applications where low power draw is preferred
• Amber turn signal circuits that require a distinct signal color
• Owners seeking a durable, vibration-resistant lighting solution

Key specifications

• Base type: BAU15s (bayonet single-contact)
• Function: Dual-mode — daytime running light and amber turn signal
• Light source: LED
• Color output: White/daylight for DRL function and amber for turn signal
• Power consumption: Significantly lower than equivalent incandescent lamps
• Mechanical fit: Designed to replace P21W/PY21W form-factor bulbs

How to use

Ensure the vehicle socket is BAU15s and the electrical circuit is compatible with LED replacements. Remove the original P21W/PY21W bulb by depressing and twisting the bayonet base, then insert the Amio LED bulb into the socket and rotate until it locks. Check that polarity and function are correct: the bulb should operate as a daytime running light in the DRL circuit and display amber when the turn signal is activated. If hyperflashing or error messages occur on the vehicle’s dashboard, use a compatible resistor or CAN-bus adapter as required by the vehicle electronics.

Usage recommendations

Install matching bulbs on both sides of an axle to maintain balanced lighting appearance and to ensure consistent signal visibility. Verify local vehicle lighting regulations before use and, if necessary, consult a professional installer to confirm compatibility with the vehicle’s electrical system.