Which measurement is given in Lux or Foot-candles?

The measurement expressed in Lux or Foot-candles corresponds to illuminance, which refers to the amount of light that falls onto a surface. Specifically, one Lux is defined as one lumen per square meter, while one Foot-candle is equivalent to one lumen per square foot. These measurements are crucial in assessing how well a space is lit, indicating the illumination provided by lighting sources on a given area.

Illuminance plays a significant role in lighting design and ensuring that environments are adequately lit for various tasks. By using these units (Lux and Foot-candles), one can effectively evaluate and compare lighting levels in different spaces, which is essential for optimal visual comfort and safety. This understanding is necessary for applications such as architectural design, occupational health, and ergonomics, where appropriate lighting can impact performance and well-being.