This listing features one pair (2 pieces) S-HCR version H8/H9/H11 LED headlight bulbs, each H8/H9/H11 LED headlight bulb's light output 4700 lumens per bulb (the maximum light output will be up to 5000 lumens per H8/H9/H11 LED headlight bulb, total will be 10,000 lumens for both H8/H9/H11 LED headlight,) one for the driver side, and the other one for the passenger side. Cross Reference Number: H8, H11, H16, H9, H8LL, H11LL, H9LL, etc. Applications: Used for replacing stock halogen or HID H8 H9 H16 H11 headlights, fog lights, daytime running lights (DRL) or cornering lights bulbs for better vision & safer, smarter, better and brighter driving. Beam Pattern Comparison Between Stock Halogen vs Alla Lighting H11 LED Headlights Bulbs Based on the above beam pattern between stock halogen headlights bulbs and Alla Lighting S-HCR version H11 LED headlights Bulbs, conclusions as below: Alla Lighting H11 LED headlights bulbs shows the same perfect clear beam cut-off pattern as stock halogen bulbs, which can avoid the anti-glare or blinking other driversAlla Lighting H11 LED headlights bulbs shows xtreme super bright xenon white color, the stock halogen headlamps shows dim yellowish color, which makes the vehicle's' vision much brighter and equipped with quite different appearance upgrade. More than 400% brighter than stock halogen headlamp: Alla S-HCR version H8/H9/H11 headlight output lumens is up to 4700 lumens per bulb, yet the stock halogen headlamp is about 980 lumens. Road Performance Comparison between Stock Halogen Headlamp VS Alla Lighting S-HCR H11 LED Headlight Bulbs Alla Lighting S-HCR H8/H9/H11 LED headlight bulbs shows clear xenon white color and much brighter beam direction for much safer driving; Yet the stock lamp only shows the dim yellowish light, it is hard to see clearly while driving, especially at foggy, snowy or rainy weather. Luxury upgrade to Alla Lighting S-HCR H8/H9/H11 version led headlight, which will make your car more attractiveMore than 400% brighter than stock halogen headlamp: Alla S-HCR version H8/H9/H11 headlight output lumens is up to 4700 lumens per bulb, yet the stock halogen headlamp is about 980 lumens. Much more accurate centered focus light output than stock halogen headlamp, and will have better vision at night. Close Shot Close shot of the light performance: Clear & extremely super bright 6000K xenon white color, amazing improvement & luxury upgrade. Performance Comparison Left is stock halogen headlamps, and right is Alla Lighting S-HCR LED headlights, which shows much difference light output. High Performance Road Test After upgrade to LED headlights bulbs, fog lights, high performance light output. Specifications Advanced Cooling System Insert EMC intelligent temperature control system to control the cooling in effective wayBuilt-in high speed heat dissipation fanUltra-Slim high conductivity copper substrate board for the best cooling Two Way of Cooling Left is Alla Lighting S-HCR version H11 LED headlight bulbs, the lumens is up to 4700 lux per bulb (maximum 5000lm)Right is stock halogen headlamp, the lumen is 980 luxAlla Lighting LED bulbs >400% OEM bulb Specifications Equipped with CREE multi-core eutectic technologyInsert EMC intelligent temperature systemBuilt-in double sided laminated cooper substrate with high thermal conductivity Product Diameter Length: 3.15 inch in totalDiameter: 1.18 inch (Bottom)Diameter:0.57 inch (top)Length: 1.25 inch from Bottom to locking adapter Long Lifespan Equipped with double ways for heat dissipation: 0.8mm high thermal conductivity ultra thin copper substrate and high speed Turbo fan for best cooling and increase the lifespan Premium Package The LED headlight bulbs are packed with solid foam and box to make sure the product no damage during the shipping.