This OSRAM EVD 400 watts 36 volts HLX MR16 bulb has a base of G6.35 Bipin. It has a diameter of .59 inches and a clear lamp finish. It has lumens of 16000, a maximum overall length of 2.34 inches and a rated life of 50 hours.Abbreviation NameEVD 64663 HLX BaseGX6.35 2-PinBulb TypeHalogen BulbsColor Rendering Index (CRI)100Diameter (in) .59 FilamentC-Bar-6Lamp FinishClearLuminous Flux (LM)16000Maximum Overall Length (in) 2.34 Rated Life (Hours)50ShapeT6Voltage (V)36VWattage (W)400W