This denotes the efficiency of the bulb to convert electricity into light.

The energy efficiency of light sources is typically measured in lumens per watt (lm/W), meaning the amount of light produced for each watt of electricity consumed.

Long-term research and development calls for white-light LEDs producing 160 lm/W in costeffective, market-ready systems by 2025. In the meantime, how does the luminous efficacy of today’s white LEDs compare to traditional light sources? Currently, the best white LEDs approach the efficacy of compact fluorescent lamps (CFLs).