Compared with fluorescent lamps, LED lamps generally have higher efficacy.

Compared with fluorescent lamps, LED lamps generally have higher efficacy.

• A. True
• B. False
• C. They have the same efficacy
• D. Fluorescent is higher

Answer: (A)

Luminous efficacy, measured in lumens per watt, shows how efficiently a light source converts electrical power into visible light. LED lamps generally deliver more lumens per watt than fluorescent lamps, especially with modern LED technology and optimized drivers. This higher efficiency comes from LEDs turning more of the electrical energy directly into light with fewer losses from ballast and phosphor conversion, whereas fluorescent lamps rely on gas discharge and phosphor processes and often incur ballast losses. As a result, for the same amount of electrical power, LEDs typically produce more light, making the statement true. In practice, you’ll see fluorescent tubes around the range of about 90–100 lm/W, while LEDs commonly range from roughly 100–180 lm/W (with some high-end options even higher), though real-world performance depends on exact models, operating conditions, and how the lighting system is configured.

Luminous efficacy, measured in lumens per watt, shows how efficiently a light source converts electrical power into visible light. LED lamps generally deliver more lumens per watt than fluorescent lamps, especially with modern LED technology and optimized drivers. This higher efficiency comes from LEDs turning more of the electrical energy directly into light with fewer losses from ballast and phosphor conversion, whereas fluorescent lamps rely on gas discharge and phosphor processes and often incur ballast losses. As a result, for the same amount of electrical power, LEDs typically produce more light, making the statement true. In practice, you’ll see fluorescent tubes around the range of about 90–100 lm/W, while LEDs commonly range from roughly 100–180 lm/W (with some high-end options even higher), though real-world performance depends on exact models, operating conditions, and how the lighting system is configured.