Illuminance Distance Calculator - Free Online Tool

Illuminance is the measure of light falling onto a surface, typically measured in lux (lumens per square meter). The distance between your light source and the work area significantly impacts the required illuminance. Our calculator simplifies this complex relationship by allowing you to input key variables.

You simply need three pieces of information: the desired illuminance level (e.g., 500 lux for desk work), the type and wattage of your light source, and the distance from the fixture to the surface you are measuring.

The tool then applies established photometric principles to determine if the setup is adequate or calculates the minimum required distance. This instant calculation helps ensure that the light intensity reaching your task area meets optimal standards, preventing under- or over-lighting issues in your workspace.

To get the most accurate and practical results from this illuminance calculator, consider these simple best practices when planning your lighting:

• Define the Task: Before calculating, precisely define what you are doing (e.g., writing fine print requires higher lux than general browsing).
• Account for Glare: Remember that high intensity is not always good; excessive glare can be just as detrimental as low light. Try to position fixtures indirectly.
• Measure the Surface: If your work surface isn't flat, measure the area where the light needs to land, not just the general vicinity.

If you are retrofitting an existing space, take multiple measurements and average them out rather than relying on a single reading. This ensures your final lighting plan is robust.