The FEL lamp (less accurately called a light bulb) 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.
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The calibration lamps are generally modified to use a larger bi-post base that fits into special kinematic mount sockets for precise optical alignment.
LAMP | Arc lamp | LED lamp | LAMP (software bundle) | lamp (electrical component) | Lamp | lamp | arc lamp | The Blue Lamp | safety lamp | Neon lamp | High-intensity discharge lamp | Compact fluorescent lamp | Carbide lamp | ''When It's Lamp Lighting Time In The Valley'' | When It's Lamp Lighting Time in the Valley | Tiffany lamp | ''The lady with the lamp'' — Miss Nightingale at Selimiye Barracks | Signal lamp | Safety lamp | Oil lamp | Metal-halide lamp | Hefner lamp | Fluorescent lamp | Electrodeless lamp | Davy lamp | Butter lamp | Argand lamp with circular wick and glass chimney. (Illustration from ''Les Merveilles de la science'' 1867-1869 | Anglepoise lamp | Aladdin and His Lamp |