Luminous Intensity Converter
Convert units of luminous intensity, luminance, and luminous flux
Features
Convert 4 luminosity areas at once
Covers luminous intensity, luminance, luminous flux, and illuminance together
Supports 21 specialized units
Broadly covers candela, nit, lux, and more
Instantly convert all units on input
Show the results in each unit from a single value at once
Copy results with one click
Instantly get the conversion result with the copy button
How to Use
Select the area to convert
Choose the target category from luminous intensity, luminance, luminous flux, and illuminance
Specify the base unit
Select the unit of the input value from the base unit list
Enter a value to convert
Enter a number in the value field to automatically convert to other units
Check and copy the result
Check the conversion result in the list and get it with the copy button
Use Cases
Calculate brightness in lighting design
Convert lux and lumen to consider the illuminance of installed lighting
Compare display luminance
Convert nit and candela per square meter to compare screen performance
Study physics and engineering
Learn luminosity-related unit conversions for homework and exam prep
Convert old units to modern ones
Reinterpret old units such as candlepower and stilb into current units
Basic Knowledge
Difference Between Lumens and Lux
Lumen (lm) is the unit of total light emitted by a light source (luminous flux), while lux (lx) is the unit of brightness on an illuminated surface (illuminance). One lux is the brightness when 1 lumen of light reaches 1 square meter. When choosing lighting, fixtures are measured in lumens, while surface brightness is measured in lux.
What is Candela
Candela (cd) is an SI base unit that expresses the intensity of light (luminous intensity) emitted by a light source in a specific direction. The name derives from the fact that the brightness of approximately one candle equals roughly 1 candela.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
the unit conversion calculation is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
the numbers you entered and the conversion result and input suggestions are not stored on the server.
Follow RAKKOTOOLS on Google Search
220 useful tools become easier to find from Google Search and AI Search!
- Found in search
- Also shown in AI Search
- Discover new tools
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
If you mention it, I get motivated to create more tools!
If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.