Over time the filament gets thinner until it breaks. An incandescent bulb's warm light complements skin tones. However, incandescent lighting is the most inefficient of the common lighting choices. Standard incandescents are the lowest in initial cost, but since 81 percent of the energy they consume turns into heat and not light, they are not at all efficient. Full Spectrum Full spectrum lighting is actually a color-corrected variation on incandescent technology.
Colors show up accurately, and the contrast between black and white is increased.
Full-spectrum lighting may act to boost the immune system in the same way as natural sunlight. The Verilux full spectrum brand also offers economical long life. The halogen lighting design is a somewhat more energy efficient variation on incandescent technology. The sealed bulb contains a tightly-coiled tungsten filament surrounded by halogen gas. During use, halogen combines with evaporating tungsten, redepositing tungsten on the filament, thus slowing down the rate at which the filament breaks down.