Light Exposure

2-1-070

The product of an illuminance (E) and its duration (dt).

Symbol: H H = ?E.dt

Unit: lux-second (lx.s)

Note 1: Formerly Quantity of Illumination and, in French, Quantite d'Eclairement.

Note 2: Equivalent definition Surface density of the quantity of light received.

Reference: C.I.E. (modified)

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

English