SYLVANIA - 4057 ZEVO LED Red Bulb - Bright LED Bulb, Ideal for Stop and Tail Lights (Contains 2 Bulbs) LIGHTS DIM OVER TIME, REPLACE IN PAIRS: Your lights are a pair, one is never turned on without the other. If one bulb burns out, the other isn't far behind. Replace your 4057 in pairs for optimum performance. DELIVERS A BRIGHTER & SHARPER LIGHT: This is a RED LED bulb  Ideal for stop and tail lights. ACHIEVE FULL BRIGHTNESS INSTANTLY FOR INCREASED SAFETY: These 4057 ZEVO LEDs light up instantly for increased safety, giving drivers around you more time to react compared to standard incandescent bulbs' slower light up speed. MAY REQUIRE A LOAD EQUALIZER FOR OPTIMUM PERFORMANCE: To help prevent hyper flashing, it is suggested that a load equalizer be installed. See Sylvania's Load Equalizer product. THE SYLVANIA STANDARD OF QUALITY: With 100+ years in business, Sylvania is the world leader in automotive lighting for Original Equipment Manufacturers (OEMs) and the aftermarket.