2015 Denali, I hated the halogen in projector lights and ordered the HID replacements that fit right in the projectors. less than 2 hours to install and less than $200 for the entire kit from RetroFit. So bright you would be amazed! Love them! I also got the super bright LED replacement fog lights that have the same flat on top beam look as the projectors, WOW, 200 % better than stock! They also were under $200 per set. I am now super happy with the light brightness and projection. My son-in-law was so impressed he installed same set up on his 2015 silverado