I have a 2015 Gunner and am looking to upgrade the headlight. I need to understand what the Gunner stock headlight currently consists of. There is a light in the center of the headlight bucket and a smaller light lower in the headlight bucket. When i turn on the lights both lights appear to come on. When I hit the hi beams the center light appears to be brighter. Just looking to understand the what the lights do and what I need to upgrade to HID of LED.