A tool or method that facilitates the conversion between luminous flux, measured in lumens, and illuminance, measured in lux. Illuminance quantifies the amount of light falling on a surface, while luminous flux measures the total light emitted by a source. For example, a light source emitting 1000 lumens spread evenly over an area of 1 square meter will produce an illuminance of 1000 lux on that surface. Different types of conversion methods and interfaces for calculating the conversion are exist.
Determining the appropriate level of illumination for a given space is vital in lighting design. Utilizing a conversion method aids in selecting light sources with the correct output to achieve desired lighting conditions. This is essential for creating comfortable and functional environments, impacting safety, productivity, and energy efficiency. Historically, such conversions were performed manually using formulas and tables. The advent of electronic calculators and software has simplified and expedited this process.