x_{1} is emitted/reflected light that measures to be x_{2} magnitudes in luminous brightness, on scale (si'o)/using reference value/under system/according to definition x_{3}, in logarithmic base x_{4} (default: decimal (10))

Wavelength is specified in x1; it is improper to submit an object as the sumti for x1. The type of magnitude (absolute, apparent, etc.) must be specified by tanru or lujvo. x2 must be a pure number (dimensionless). x3 should specify a reference emission and the associated reference value in magnitudes, the meaning of a change by 1 magnitude, and the direction of increasing brightness (traditionally: toward negative infinity); magnitude is defined for all real numbers. See also: cmagnitude.

- cmagnitude
- x
_{1}is emitted/reflected light that measures to be x_{2}magnitudes in luminous brightness, on scale (si'o)/using reference value/under system/according to definition x_{3}, in logarithmic base x_{4}(default: decimal (10))