It's an easy task to compare and see that LED light bulbs are truly the most energy-efficient. LED bulbs produce 90 to 112 lumens per watt. Compact Fluorescent Lamps produce 40 to 70 lumens per watt, and traditional incandescent bulb fixtures only produce 10 to 17 lumens per watt.

Which of the following lamp has highest luminous efficiency?

The highest perception of brightness experienced by the human eye is generated with green light on the 555 nm wavelength. The greatest luminous efficacy which can theoretically be achieved at 555 nm is, altogether, 683 lm/W.

What is luminous efficiency of a lamp?

Luminous efficacy is defined as the rate of the lamp total luminous flux to the total electric power consumed by the lamp, usually expressed in lumens per watt.