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Foot-lambert calculator
To calculate from screen dimensions,
click here
Luminance
foot-lambert
candela-m2
nit
candela-sqft
Convert Luminance!
Luminance conversion
2.5 cd/m
2
(candela per square meter)
0.2323 cd/sq.ft. (candela per square foot)
0.7297 ftL (foot-lambert)
4.32 EV (Exposure Value)
Screen luminance: EV4.32
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
starlight to dim ambient light
moon eclipse to night home interior
neon lights to landscape after sunset
bright light to weak sun
bright daylight to direct sunlight
Explanation
A foot-lambert or footlambert (ftL, sometimes fl or ft-L) is a unit of luminance. For screens that are projected upon (like cinema, home cinema), it quantifies how much light is reflected (to the center of the room). This depends on the amount of light produced (lumens), the size of the screen and the screen gain.
Examples
Cinema: 32000 lumen on 23x10m screen
References
Foot-lambert
Lambert
Screen gain