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GU10 bases are included in the ENERGY STAR Lamps specification. What ANSI lamp shapes have the GU10 base? Follow

All LED lamps must conform to the shapes identified in the relevant ANSI standards. ANSI C78.79-2014 American National Standard for Electric Lamps—Nomenclature for Envelope Shapes Intended for Use with Electric Lamps and  ANSI C78.50-2014 American National Standard for Electric Lamps—Assigned LED Lamp Codes are the only standards that contain a designation and space drawing for a lamp with a GU10 base, and ANSI has designated that shape as a PAR 16. 

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