This standard specifies the appearance and main dimensions of the glass bulb of the G-type series electric light source. This standard applies to G-type series electric light source glass bulbs.
QB/T 2049.4-1994 history
2013QB/T 2049.4-2013 Glass bulb dimensions for lamps.G series shapes
1995QB/T 2049.4-1994 Glass envelope of electric light source Dimension of G model glass envelope