Are still used

Incandescent lamps that are still used, but are already losing their popularity, usually have a power of 40 to 100 watts, although there are other options. The efficiency of such a bulb is very low, about 50%, which means that the lamp pays for itself only half. The rest of the energy is spent on heating the glass and other elements. The energy -saving lamp is more convenient than the incandescent lamp in that it does not have a thread thread, which gives light.