3.5 Inch Line Voltage MR16 Non-IC New Construction housing for areas without insulation. Internal thermal protection. Requires one 50 watt maximum 120 volt GU10 MR16 halogen lamp, not included. Can also be used with one 2 watt 120 volt GU10 MR16 LED lamp, not included. cUL listed. For use with trims X3501, X3502, X3503, X3504, X3505, X3507 and X3508. Dimensions: 10.6 inch length x 13.4 inch width x 5.5 inch height. 3.622 inch ceiling cut out.