Compact Fluorescent Lamp (CFL) - Energy-Efficient Lighting Solution #2280950 (License: Personal Use)

This illustration shows a typical compact fluorescent lamp (CFL) featuring a double-spiral glass tube wound around a central base, housing the electronic ballast. The bulb uses mercury vapor and phosphor coating to produce light more efficiently than incandescent bulbs, though it has largely been superseded by LED technology. Its standardized screw-in base allows direct replacement in most household fixtures.

Used on energy-efficiency guides, lighting comparison articles, sustainability blogs, or product pages for retrofits; matches user intent for learning about historical energy-saving bulbs or identifying older lighting types.