If you are talking about the recessed fixture with halogen bulb then they require a small twist counter-clockwise and pull down. I have a bunch of those in the 5th and while most came right off a couple required lots of effort to remove. I used a rubber jar lid gripper to help. Was still a bear tho.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks