FEL lamp
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The FEL
GE, Osram, Ushio, Eiko, and Philips. Note that the term FEL is an ANSI designation (not an acronym).[1]
Description
What sets this apart from other lamps used for similar purposes is that it almost literally sets the standard (more precisely, it is the means by which the standard is transmitted from one location to another). Specially seasoned and calibrated FEL lamps are used in laboratories as
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
filament
will recrystallize according to the applied DC polarity.
References
- ^ "Once is Enough in Radiometric Calibrations (includes a typical spectral plot)" (PDF). nist.gov. Retrieved 2017-11-25.