The Osram HBO 200 W/2 L1 is a 200 watt Mercury Short Arc lamp with 9500 lumens visible light output. Typical lifetime is 400 hours. This lamp has two SFc10-4 bases on the 17mm diameter x 128mm 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 69198, HBO100W/2L1, HBO100W2L1, HBO-100W/2-L1, HBO200W2-L1, HBO200W/2-L1 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.