The Sylvania 54025/64225 opthalmic lamp has a T3 bulb shape and a G4 base type. It operates at 10 watts and 6 volts and will typically last an average of 100 hours. This bulb has a base down/horizontal burning position. The 54025/64225 bulb's corresponding ANSI codes are ESA/FHD. This lamp has a color temperature of 3200 Kelvin and is typically used in projection lamps, microscopes and ophthalmic lensometers.