The Osram HBO 100 W/2 is a 100 watt Mercury Short Arc lamp with 2200 lumens visible light output. Typical lifetime is 200 hours. This lamp has SFa7.5-2 (anode) and SFa9-2 (cathode) on the 10mm diameter x 90mm long clear double-ended bulb. This item is made by Osram, and is also commonly available from no other source but Osram/Sylvania. It is seen as alternative part numbers 69217, HBO100W/2, HBO100W2, HBO-100W/2, HBO100W, HBO100, Olympus 8-B192, Zeiss 38-00-18-4050, Leica 500-138, Nikon 5554-0102, Ushio USH-102DH, USH-102D and other variations. Mercury Lamp Product Warning: Mercury Short Arc lamps emit harmful ULTRAVIOLET RADIATION, are under HIGH PRESSURE, require a HIGH VOLTAGE ignition, and can GENERATE OZONE (unless designated "OFR".) These lamps get VERY HOT during operation, and remain hot after operation for a significant time. Avoid direct or reflected exposure as this can cause serious skin burns and eye injury. This lamp should only be operated in properly designed and maintained equipment.