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Convert between lumens, lux, candela, foot-candles, and nits instantly. Perfect for lighting design, photography, and display specifications.
Total luminous flux emitted by a light source
Illuminance - lumens per square meter
Luminous intensity in a given direction
Illuminance - lumens per square foot
Luminance - candela per square meter
Note: Light measurements are context-dependent. These conversions assume standard reference conditions (e.g., point source at 1 meter distance for lux/candela relationships). Actual values may vary based on distance, surface area, and light source characteristics.
Measures the total amount of visible light emitted by a source. A standard 60W incandescent bulb produces about 800 lumens.
Measures illuminance - how much light falls on a surface. Direct sunlight provides about 100,000 lux, while a well-lit office is around 500 lux.
Measures luminous intensity in a specific direction. It's the SI base unit for light measurement and describes how bright a light source appears.
Imperial unit for illuminance, equal to one lumen per square foot. Commonly used in North America for architectural lighting specifications.
Measures luminance - the brightness of a surface or display. Modern smartphone displays typically range from 400-1000 nits for typical brightness.
Calculate required lumens for rooms, ensure proper lux levels for workspaces, and design efficient lighting systems.
Understand light intensity for exposure settings, compare lighting equipment, and achieve consistent results.
Compare screen brightness in nits, evaluate display specifications, and understand viewing conditions.