[el-em]

Definitions

1. noun

A light meter, especially one used in photography to measure the light falling on a subject.

“The photographer used an lm to gauge the ideal exposure for the shot.”

2. initialism

Light meter

“The camera has a built-in lm to assist with exposure settings.”

3. initialism

Lux meter

“The lm measured 50 lux in the dimly lit room.”