A Lux to Watts calculator is an essential tool for converting illuminance (measured in lux) to electrical power (measured in watts). This conversion is crucial for understanding the energy requirements of various lighting setups. To perform this calculation, you'll need the illuminance in lux, the surface area in either square meters or square feet, and the luminous efficacy of the light source in lumens per watt. The formula used is: Power (W) = Illuminance (lx) × Area (m²) / Luminous Efficacy (lm/W). By inputting these values into the calculator, you can determine the power consumption necessary to achieve a desired level of illumination. This is particularly useful for designing energy-efficient lighting systems and ensuring adequate lighting levels in various environments.