Illuminance Converter

Convert Illuminance Units: Microlux, Millilux, Lux, Kilolux, and More with our Illuminance Converter Tool

Illuminance, the measurement of the amount of light falling on a surface, is a fundamental concept in lighting design, photography, architecture, and various scientific fields. Precise conversions between different illuminance units are essential for ensuring the right amount of light in a given space or accurately interpreting measurement data. In this comprehensive guide, we will explore the world of illuminance, introduce you to the Illuminance Converter Tool, and show you how to effortlessly convert illuminance units such as microlux (ulx), millilux (mlx), lux (lx), kilolux (klx), lumen per square meter (Im/m²), lumen per square centimeter (Im/cm²), and foot-candle (fc).

What Is Illuminance?

Illuminance, often referred to as illuminance level or light level, quantifies the amount of luminous flux (measured in lumens) incident on a unit area (measured in square meters or square feet) of a surface. It is a key parameter in various applications, including interior lighting design, outdoor lighting planning, photography, and scientific research.

Key Terms:

Before diving into the details of illuminance unit conversions, let's familiarize ourselves with some key terms related to illuminance:

  • Illuminance (E): Illuminance is the measure of light intensity falling on a surface. It is typically expressed in lux (lx) and is calculated as the number of lumens per square meter (Im/m²).

  • Luminous Flux (Φ): Luminous flux is the total amount of visible light emitted by a source, measured in lumens (lm). It characterizes the brightness of the light source.

  • Luminous Efficacy (η): Luminous efficacy is the ratio of luminous flux (in lumens) to power input (in watts) and is measured in lumens per watt (lm/W). It quantifies the efficiency of a light source in converting electrical energy into visible light.

The Importance of Illuminance Conversions

Why do we need to convert illuminance units? Here are some scenarios where illuminance conversions are crucial:

  1. Lighting Design: Lighting designers need to ensure that indoor and outdoor spaces meet recommended illuminance levels. Conversions help in specifying the right lighting fixtures.

  2. Photography: Photographers use illuminance measurements to achieve desired exposure settings. Converting units is essential when switching between different measurement systems.

  3. Energy Efficiency: Architects and engineers aim to optimize energy use in lighting systems. Conversions help in evaluating and improving the efficiency of lighting designs.

  4. Research and Analysis: Scientists and researchers use illuminance measurements in various studies. Conversions allow them to work with data from different sources and experiments.

Introducing the Illuminance Converter Tool

The Illuminance Converter Tool is a powerful resource designed to simplify illuminance unit conversions. It provides an easy-to-use interface for professionals, photographers, designers, and students to convert illuminance values accurately and efficiently. Here are some key features of this tool:

  1. Multi-Unit Conversion: The tool covers a comprehensive range of illuminance units, including microlux (ulx), millilux (mlx), lux (lx), kilolux (klx), lumen per square meter (Im/m²), lumen per square centimeter (Im/cm²), and foot-candle (fc). It caters to diverse applications and measurement systems.

  2. User-Friendly Interface: The tool's intuitive interface allows users to input the illuminance value, select the source unit, choose the target unit, and instantly view the converted result. It is designed to be accessible to users of all levels of expertise.

  3. Accuracy: Precise conversions are critical in lighting design and related fields. The Illuminance Converter Tool ensures that conversions are carried out with precision, reducing the risk of errors in critical applications.

  4. Versatility: Whether you are working on architectural lighting plans, photography setups, or scientific research, the portability of the tool makes it a versatile companion. It can be used in the field, in the studio, or in the lab.

How to Use the Illuminance Converter Tool

Using the Illuminance Converter Tool is straightforward and can be done in a few simple steps:

  1. Select the Source Unit: Start by identifying the unit of illuminance you have. For instance, if you have an illuminance measurement in lux (lx), select "lx" as your source unit.

  2. Enter the Value: Input the numerical value of the illuminance measurement you want to convert. For example, if you have 500 lx, enter "500" into the converter.

  3. Choose the Target Unit: Next, select the unit you want to convert to. If you wish to convert lux (lx) to foot candles (fc), choose "fc" as your target unit.

  4. View the Result: The Illuminance Converter Tool will instantly display the converted value. In our example, 500 lx would be equivalent to approximately 46.45 fc.

  5. Repeat as Needed: You can use the tool for multiple conversions as required, making it an invaluable tool for various applications and scenarios.

Applications of the Illuminance Converter Tool

The Illuminance Converter Tool has a wide range of applications across different fields:

  1. Lighting Design: Lighting designers use it to ensure that interior and exterior spaces meet recommended illuminance levels for safety, comfort, and aesthetics.

  2. Photography: Photographers use it to adjust exposure settings and lighting setups to achieve desired effects in their photographs.

  3. Architecture and Engineering: Architects and engineers use it to optimize lighting designs for energy efficiency and occupant comfort.

  4. Environmental Studies: Researchers in environmental science use it to measure and analyze natural and artificial light in various ecosystems.

  5. Education: Educational institutions use it to teach students about illuminance and its measurement, making complex concepts more accessible.


The Illuminance Converter Tool simplifies the world of illuminance conversions, making it accessible to professionals, students, and enthusiasts across diverse fields. Whether you are designing lighting systems, capturing stunning photographs, or conducting scientific research, this tool empowers you to make precise conversions between microlux (ulx), millilux (mlx), lux (lx), kilolux (klx), lumen per square meter (Im/m²), lumen per square centimeter (Im/cm²), and foot-candle (fc). With its user-friendly interface and unwavering accuracy, the Illuminance Converter Tool is an invaluable addition to any toolkit. Embrace the power of accurate illuminance conversions and elevate your mastery of lighting concepts with this indispensable tool.