Lamp Efficiency for Illumination

The question asks which lamp type provides the most light output (illumination) for a low power input (wattage). This is determined by a lamp's luminous efficacy, measured in lumens per watt (lm/W). A higher lm/W rating signifies greater efficiency, meaning more light is produced for less energy consumed.

Analysis of Lamp Types

• Incandescent Lamps: These are the least efficient, converting a significant portion of energy into heat rather than light. Their luminous efficacy is very low, typically around 10-17 lm/W.
• Fluorescent Lamps: These offer better efficiency than incandescent lamps. Their luminous efficacy ranges generally from 50-100 lm/W.
• Compact Fluorescent Lamps (CFLs): These are more energy-efficient versions of fluorescent lamps, with luminous efficacy typically between 60-110 lm/W.
• LED Lamps: Light Emitting Diodes (LEDs) are currently the most efficient lighting technology widely available. They provide the highest luminous efficacy, often ranging from 80 lm/W up to 150 lm/W and beyond, offering the most illumination for low wattage.

Conclusion

Comparing the luminous efficacy, LED lamps deliver the most illumination for low wattage consumed.