W. J. Looyen has written:

'CAESAR, a CCD airborne experimental scanner for applications in remote sensing radiometric and geometric calibration' -- subject(s): Airborne equipment, Multispectral band scanners, Pushbroom sensor modes, Remote sensing

Early settlers placed diverging reflective or mirrored surfaces behind oil lamps on walls to help to better increase their radiance by reflecting the light that would otherwise be hitting the wall.

In the light measurement industry calibration standards can refer to both precision light sources and detector based systems ( These are used to calibrate instruments for taking measurements in science and industry. Calibration standards are often traceable to the National Institute of Standards and Technology (NIST).

An example of a calibration standard is the RS-12 calibration light source (http://www.gamma-sci.com/products/rs-12-calibration-light-source/). This serves as a white-light standard of spectral radiance and luminance.

The TIA 3000 measurement systems are detector-based absolute standards for different high accuracy measurements. Standard calibrations are directly traceable to NIST

Upon arrival, her radiance lit the room; and then... she smiled at me.

you just have to include radiance in a sentence.