Illuminance Converter
All Illuminance Conversions
Practical Applications
Lighting design, photography, architecture, occupational safety, horticulture, and cinema.
Historical Context
Scientific measurement of illuminance developed in the 19th century with pioneering work in photometry by Johann Lambert and later Pierre Bouguer.
Did You Know?
On a clear sunny day, outdoor illuminance can reach 100,000 lux, while full moonlight provides only about 0.25 lux.
Common pairs of Illuminance
Foot-candle
Illuminance Converter
Our Illuminance converter supports all major units used worldwide for this type of measurement, covering both metric (SI) and non-metric systems. Select any source and destination unit from the dropdowns, enter your value, and the result appears immediately. You can also adjust the number of decimal places to match your precision requirements.
All Illuminance conversions use standardized conversion factors defined by international scientific bodies such as the BIPM (Bureau International des Poids et Mesures) and NIST. Results are computed with full floating-point precision, so you can trust the output for technical, scientific, and everyday use.
Yes. Our Illuminance converter handles conversions between metric (SI) units and non-metric systems, including imperial and US customary units. Simply select the units you want to work with — the converter handles the math automatically, regardless of which system each unit belongs to.
Select the source unit in the first dropdown, type your value in the input field, then select the target unit in the second dropdown. The converted result appears instantly. You can swap the units at any time to perform the reverse conversion, and you can adjust the decimal places shown in the output.
Yes, the Illuminance converter is completely free, with no sign-up or registration required. It works on any device and browser — including smartphones and tablets — with no usage limits.