The Osram H44GS-100/MDSKSP is a 100 watt Mercury HID lamp with 8 degree beam angle. Typical lifetime is 16000 hours. This lamp has medium skirt E26 basing on the 121mm diameter x 131mm long black back PAR38 reflector. This item is made by Osram, and is also commonly available from UVP. It is seen as alternative part numbers 68846, H44GS-100/MD, H44GS100MDSK, H44GS-100MED, HR100PSP44/MED, UVP 34-0054-01 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.