About
"About" tools
Development blog
Contact
History
Privacy Statement
Terms & Conditions
How to use the tools
Calculator
"Calculator" tools
Acceleration calculator
Distance calculator
Electric Car calculator
Exponential growth
Fuel Cost calculator
Gladwell's 10000 hours
Speed converter
Bandwidth convert
Data size calculator
Frequency Calculator
Electrical power
Wavelength Calculator
Mortgage loan calculator
Color
"Color" tools
CMYK conversion
HTML Color list
Pantone Color list
RGB conversion
Websafe Color list
Data
"Data" tools
Bash boilerplate
Music
"Music" tools
Beats-per-minute
Audio delay
Music Frequency
Song length
Music Scale
Tap your tempo
Photo
"Photo" tools
Aspect ratio
Composition Calculator
Depth-of-Field Calculator
DPI calculator
Image filesize calculator
Light calculator (EV)
Megapixel calculator
Megapixel Aspects
Video
"Video" tools
Audio file size calculator
Common bitrates
DCP file size
Foot-Lambert Calculator
Screen size
Video bitrate
Frame rate convert
Video file size calculator
Web
"Web" tools
Content Security Policy
Redirection check
Security Policy Framework check
HTTPS config check
HTML char map
Emoji char map
HTML encoder
SEO Performance
Video
Foot-Lambert Calculator
Foot-lambert calculator
To directly input luminance values,
click here
Screen diagonal
meter (m)
centimeter (cm)
millimeter (mm)
feet (ft)
inch (in)
Aspect ratio
Square (1:1)
Photo (3:2)
Full HD (16:9)
Cinema Flat (1.85)
Cinema Scope (2.35)
Cinema Scope (2.39)
Screen gain
neutral (1.0)
lowest for white screen (0.65)
highest for white screen (1.3)
lowest for gray screen (0.45)
highest for gray screen (2.4)
Lumens
Calculate luminance!
Notice
: Undefined index: screendiagonal_calc in
/srv/data/web/vhosts/toolstud.io/htdocs/video/lambert.php
on line
64
Warning
: Division by zero in
/srv/data/web/vhosts/toolstud.io/htdocs/video/lambert.php
on line
69
Foot-Lambert: INF
Luminance =
INF ftL
(foot-lambert)
This is a lot of light. You're gonna have to wear shades.
Luminance =
INF cd/m2
(candela/square meter or
nit
)
INF EV
(exposure value)
Screen luminance: EVINF
-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