This BAU15S LED bulb is designed to standard amber PY21W/581 bulbs in automotive lighting. The amber yellow color provides visibility for indicators and turn signals, helping to clearly communicate your signaling intentions. Key benefits Energy efficient replacement for incandescent amber bulbs Bright amber light for clear signaling Longer life reduces replacements and maintenance Instant full brightness with no warmup time Key attributes Base: BAU15S (15 mm bayonet mounting with a single contact) Bulb type: LED Color: Amber Yellow Socket compatibility: PY21W/581 designations Construction: durable LED chips in a robust encapsulated housing Performance Low power consumption compared with incandescent equivalents Instanton performance with stable amber color across operating temperatures Built to withstand regular vehicle vibrations and temperature variations Use cases Front or rear indicator/turn signals on cars and light trucks Side marker lights on trailers, caravans, and motorcycles Indicator lighting on boats, RVs, and other vehicles requiring amber signaling Installation notes Designed for direct replacement in BAU15S sockets designed for PY21W/581 bulbs Check your vehicle's electrical system compatibility; some setups may require load resistors to prevent hyperflash or to ensure proper signaling This description reflects the product's brandequivalent specifications and features: amber BAU15S base LED bulbs with PY21W/581 compatibility, optimized for automotive indicator and signaling applications.