Question

what is the least efficient lightbulb? fluorescent lights incandescent lights led lights

Explanation:

Incandescent lights produce light by heating a filament until it glows. A large amount of energy is wasted as heat rather than converted into light. Fluorescent lights use less energy than incandescent as they produce light through a different mechanism (exciting mercury vapor). LED lights are the most energy - efficient as they convert a high percentage of electrical energy into light.

Answer:

incandescent lights