Low voltage (12V) MR16 lamp (sold separately). Porcelin Bi Pin socket type GX5.3. MR16 LED lamp is compatible with E15 electronic transformer option. Designed for typical 5/8" drywall applications. 18 Ga. galvanized steel junction box. Over lamping protection. Approved for branch circuit wiring. Housing can is 18 GA. aluminum with a black powder coated paint finish.