What is the typical luminous efficacy range for MBF/MBI lamps?

What is the typical luminous efficacy range for MBF/MBI lamps?

• A. 10-20 lm/W
• B. 44-83 lm/W
• C. 100-150 lm/W
• D. 200-300 lm/W

Answer: (B)

Luminous efficacy shows how efficiently a lamp turns electrical power into visible light, measured in lumens per watt. For MBF/MBI lamps, which are older fluorescent-discharge types, the practical efficiency typically falls in the tens of lumens per watt, specifically around 44 to 83 lm/W. This range reflects the limits of the phosphor technology, the spectrum produced by the lamp, and energy losses in the ballast and electrodes. Very low values (about 10–20 lm/W) would indicate poor performance, while values dramatically higher (around 100–150 lm/W or more) are not characteristic of MBF/MBI lamps without moving to other, more modern light sources.

Luminous efficacy shows how efficiently a lamp turns electrical power into visible light, measured in lumens per watt. For MBF/MBI lamps, which are older fluorescent-discharge types, the practical efficiency typically falls in the tens of lumens per watt, specifically around 44 to 83 lm/W. This range reflects the limits of the phosphor technology, the spectrum produced by the lamp, and energy losses in the ballast and electrodes. Very low values (about 10–20 lm/W) would indicate poor performance, while values dramatically higher (around 100–150 lm/W or more) are not characteristic of MBF/MBI lamps without moving to other, more modern light sources.