OP2101 Microscope bulb by Hosobuchi. Rating: 4 to 6 Volt, 1.2Amp, 7.2Watt. Base: 9.2mm Dia. B9S Bayonet fitting. Total height: 26.8mm Glass Bulb Dia.: 14mm Status: NOS (New Old Stock) Individually tested prior to despatch : YES RoHS compliant: TBC