Crossword clues for phot

Wiktionary
phot

Etymology 1 n. A photometric unit of illuminance, or luminous flux through an area (symbol ph). Etymology 2

vb. (context informal English) to photograph#Verb

WordNet
phot

n. a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux

Wikipedia
Phot

A phot (ph) is a photometric unit of illuminance, or luminous flux through an area. It is not an SI unit, but rather is associated with the older centimetre gram second system of units. The name was coined by André Blondel in 1921.

Metric equivalence:

$$1\ \mathrm{phot} = 1\ \frac{\mathrm{lumen}}{\mathrm{centimeter}^2} = 10,000\ \frac{\mathrm{lumens}}{\mathrm{meter}^2} = 10,000\ \mathrm{lux} = 10\ \mathrm{kilolux}$$

Metric dimensions:

illuminance = luminous intensity × solid angle / length