Luminous efficiency

Luminous efficacy (luminous efficiency) defines the ratio of the luminous flux emitted by a specific light source to the energy consumed by it per unit time.

Examples of luminous efficiencies of various light sources:

• bulb: 8-10 lm / W
• halogen lamp: 16 lm / W
• fluorescent lamp: 45-104 lm / W
• white LED: 26-100lm / W
• metal halide lamp: 85-115 lm / W
• high pressure sodium lamp: 150 lm / W
• low pressure sodium lamp: 200 lm / W