Luminous–Flux theory

Luminous Flux theory describes how the human eye perceives the brightness of light. It quantifies the total visible light emitted by a source, measured in lumens. Essentially, it accounts for how bright a light appears to us, considering our eye's sensitivity to different wavelengths. This helps compare lighting sources objectively, ensuring that measurements reflect actual human perception rather than just raw light output. By understanding luminous flux, designers and engineers can create lighting that appears appropriately bright and comfortable for human environments.