G4 base desk lamps

G4

— two-pin base, assuming a diameter of pins from 0.65 to 1.05 mm and a distance between them of 4 mm. This variety is used for more traditional light bulbs, with a round or oblong bulb of small length, most often halogen. These bulbs are similar in size to those that use the E14 base (see the relevant paragraph), but for a number of reasons they are much less common, like table lamps for the G4 base.