By Tyler Lacoma • Updated Mar 24, 2022
Fluorescent and incandescent lamps have long dominated residential lighting. While incandescent bulbs have been the traditional choice, fluorescent lamps are increasingly favored for their superior energy efficiency and extended lifespan.
Wattage equivalence is determined by lumens—the amount of visible light a bulb emits. Two bulbs that produce the same lumen output will have different power requirements. For example:
When shopping, manufacturers offer bulbs in fixed wattage steps, so exact equivalents may vary slightly. Common comparisons include:
Fluorescent bulbs contain a sealed tube filled with an inert gas (usually argon) and a small amount of mercury vapor. When electricity passes through the gas, it excites the atoms, which then release ultraviolet photons. A phosphor coating on the tube’s interior absorbs the UV light and re‑emits it as visible light—a process that is highly energy‑efficient.
Incandescent bulbs rely on a tungsten filament that is heated to a high temperature by electrical current. The filament emits light, but a large portion of the energy is lost as heat, making the process less efficient. The bulb must be sealed to prevent the filament from oxidizing and burning out.
Incandescent light has a warm white hue (around 2700 K) because it emits a broad spectrum that includes significant infrared radiation. Fluorescent lamps can produce a range of color temperatures—from warm white to cool daylight (up to 6500 K). Warm‑tint fluorescents offer a more inviting ambience, while daylight‑tuned models provide a bright, natural feel.
Choosing the right bulb depends on your lighting goals: If you prioritize energy savings and longevity, fluorescents are a compelling choice; if you value the soft warmth of incandescent light, look for high‑quality LED alternatives that mimic that spectrum.
