iBrightstar 1157 (BAY15D) Switchback LED Bulbs White/Amber — Dual-Function DRL & Turn Signal, 9–24V

These iBrightstar switchback 1157 (BAY15D/P21/5W) LED bulbs deliver bright xenon-white for DRL/parking and instant amber for turn signals in a single plug-and-play unit.

Upgrade your vehicle lighting with a dual-function LED replacement that fits common 1157/BAY15D sockets. Each bulb combines 72 SMD 3014 chips and 4 SMD 3030 chips inside an aluminum housing with a projection lens and constant-current IC. Designed for 9–24V electrical systems, the pair offers long life, low power draw, and a crisp color change from white to amber for clear daytime running light and turn signal performance.

How bright are these bulbs compared with stock halogens?

These LEDs are engineered to produce substantially more visible output than factory halogen bulbs while consuming far less wattage. The combination of numerous SMD chips, an aluminum body, and a projection lens concentrates light for stronger forward illumination and clearer signaling.

• 72 SMD 3014 + 4 SMD 3030 chips per bulb for high lumen density
• Aluminum housing with projection lens for focused light
• Quoted as over 300% brighter than typical halogen equivalents
• Low power draw: ~3.5W (white) / ~4W (amber) per bulb

Will these fit my vehicle and how easy is installation?

The bulbs are made to replace a wide range of 1157/BAY15D family sockets and are plug-and-play in most applications. Always confirm socket type and bulb dimensions in your vehicle before ordering to ensure a correct fit and proper seating.

• Compatible types: 1157, BAY15D, P21/5W and many cross-references (2057, 2357, 7528, etc.)
• Working voltage range: 9–24V (suitable for 12V and 24V systems)
• Simple push-and-twist installation in compatible sockets
• Check physical measurements against your factory bulb before purchase

Do I need additional parts to prevent hyper-flashing or warnings?

Because LED bulbs draw much less current than stock filaments, some vehicles may detect a low-load condition and either hyper-flash the turn signal or show a dashboard warning. In those cases add-on load resistors or an LED-compatible flasher relay restore correct flash rate and system messages.

• May require 50W 6-ohm load resistor per circuit on some vehicles
• Or install an LED flasher relay to correct flash rate without resistors
• If a warning message appears, adding load or the relay usually resolves it
• Contact iBrightstar support if you need guidance for your vehicle

How long will these bulbs last and what are their power ratings?

Each LED bulb uses an internal constant-current driver to help maintain consistent output and protect against electrical variations, contributing to a long service life. The bulbs are rated for up to 30,000 hours under normal conditions and are specified at modest wattages for efficient operation.

• Service life: up to approximately 30,000 hours
• Power consumption: about 3.5W (white mode) and 4W (amber mode) per bulb
• Built-in constant-current IC for stable performance
• Workable across 9–24V vehicle electrical systems

Who is this for: Drivers who want a single, compact bulb that functions as both a bright white parking/DRL light and a highly visible amber turn signal. These bulbs suit DIY installers and professional fitters upgrading older halogen systems or converting to efficient LED signaling on cars, trucks, trailers, and other 12V/24V vehicles — provided socket fitment and measurements are checked beforehand. If your vehicle triggers hyper-flash or warnings, plan to add the recommended load resistors or an LED flasher relay.