http://www.NEMA.org • NEMA Reaffirms ANSI C78.1406-2004: P28 Single-Contact Medium Prefocus-Based Projection Lamps for Base-Down Operation—Dimensions. This standard establishes the dimensions essential to interchangeability of single-contact medium prefocus-based projection lamps of T10 and T12 bulb sizes. • NEMA Reaffirms ANSI C78.1407-2004:…