FEL lamp


The FEL lamp is an ANSI standard 1000 watt quartz halogen lamp with a G9.5 medium 2-pin base used in many stage and studio lights that costs around $12 and is available from a number of manufacturers including GE, Osram, Ushio, Eiko, and Philips. Note that the term FEL is an ANSI designation.
What sets this apart from other lamps used for similar purposes is that it almost literally sets the standard. Specially seasoned and calibrated FEL lamps are used in laboratories as radiance and irradiance standards used to calibrate photometers, light meters, spectrophotometers and other laboratory instruments. An FEL lamp purchased from NIST that has been calibrated for light output, color temperature, and spectral energy distribution is over ten thousand dollars. NIST Traceable FEL lamps are available from commercial suppliers.
Matching sockets for the G9.5 base include Sylvania TP22, TP220, Buhl Electric QEW-2, QEW-21, QEW-22, Bender + Wirth 968, Ushio: C-3, C-3. The calibration lamps are generally modified to use a larger bi-post base that fits into special kinematic mount sockets for precise optical alignment. Although the socket for calibration lamps is not polarized, polarity must be observed because the calibration lamps are normally run on DC and the lamp filament will recrystallize according to the applied DC polarity.