Which type of lamp is more efficient?

• A. Incandescent
• B. Neon
• C. Halogen
• D. Fluorescent

Answer: (D)

Efficiency in lighting means how many lumens you get for each watt of electrical power. Fluorescent lamps win here because they create light through a gas discharge that excites phosphors to emit visible light, which uses energy much more effectively than heating a filament. Incandescent bulbs run a hot filament, and most of the energy becomes heat rather than useful light, so they are the least efficient. Halogen lamps are a refined type of incandescent, giving a bit more light per watt but still relying on a filament, so they don’t reach the efficiency levels of fluorescents. Neon lamps produce light from a gas discharge mostly used for signs, and while they have their niche, they don’t provide as much light per watt for general illumination as fluorescent lamps. For these reasons, fluorescent lamps are typically the most efficient option for lighting.