Lithonia Lighting LTH2000 MR16 WH M24 1-Light Front Loading Commercial Track Head, 1-Circuit, Steel, Mr16-Compatible Led, White Low-profile lamp holder is made of die-cast aluminum and finished in Matte White Front loading track head uses (1) MR16 bulb which is not included. Can be paired with MR16 compatible LED or 50-Watt halogen maximum Compatible with nordic aluminum global (ges & get) track systems Uses a GU5.3 base 12V porcelain socket Evaluated and tested in accordance to UL1574 track system standard