DescriptionSize:H4 9003 Alla Lighting COB Newest Version Latest Design LED Headlight Conversion Kits-Perfect Replacement the Halogen bulbAlla Lighting pursues to offer the best valuable guaranteed led light bulbs for the customers, this led headlight adops the original reflectional light output with high illumination COB chips,aluminum materioal and cooper heat sink for much better heat dissipation to achieve longer lifespan and much further lighting distance.Here is COB LED Headlight specificationLED Chip Type:high quality and high illumination of COB chips.Fantastic heat sink design: The whole aluminum material and cooper heat sink part makes the bulb much better heat dissipation to achieve much longer lifespan up to 30000h.High illumination light: Each bulb light output will be up to the maximum 4000 lumens in perfect condition (usually about 3500 lumens per bulb),total 8000 lumens per bulb. Easy installation: For most vehicles, just Plug-N-Play, car installation manual included.yet for some European vehicles or newest version, your vehicles may require to install the load resistor or decoder to avoid the error coder or blinking-off issues. This happens due to led bulbs draw much less current than stock lamp.True 6500K Cool White Lighting: Crystal clear daytime white lighting. Plus Instant-On capability with MINI-design.