Either of two problems in calibrating Maxwellian-view optical systems can arise when troland value is calculated from measurements made by photometers requiring a visual match. Both problems lead to inaccurate estimates of light levels produced by the optical system.
© 1982 Optical Society of America
Steven L. Buck and Walter Makous, "Calibrating Maxwellian-view optical systems," J. Opt. Soc. Am. 72, 960-962 (1982)