Classic: Cars and trucks deserve modern lighting too, but only if it enhances the safety, performance, and intensity without compromising the retro look. The Holley RetroBright LED Bulbs are the perfect upgrade for owners of classic cars who need brighter lights and are unwilling to sacrifice the period-correct styling to get it. Colors: The RetroBright LED bulbs are available in several colors to suit every need. They come standard in a classic white, which is very similar in warmth to the original incandescent bulbs but with more intensity. They are also available in a modern, pure white white color, as well as red and amber for use in turn signals and brake lights. Intensity: At the core of the RetroBright bulbs is a Chip-on-Board LED filament that produces more than twice as much output as a standard incandescent filament. The LED filament has a rated lifespan of nearly 20,000 hours, runs cool to the touch, and should last withstand the same test of time that your classic has already endured! Fitment: The bulbs are encased in a glass capsule that is identically sized to the original bulb, these will be a direct upgrade in place of the old incandescent bulbs. Many other LED bulbs on the market are over-sized and will not fit inside of the compact lenses commonly found on classic vehicles. Turn Signal Relay: If you are upgrading the turn signals on your classic car or truck, you will need the optional EF32 LED Flasher Relay. This unit is specially designed to replace the old thermal flasher relay found on most classic cars and trucks, and will eliminate any hyper-flashing associated with the upgrade to LED for your turn signals.