The incandescent lamps appeared more than a hundred years ago, they became a continuation of the so -called electric arches that burned few, identified poisonous gases, and were extremely not safe. However, it is worth saying that, although they had significant technical qualities, of course they consumed a lot of electricity, and most of it was spent on heating, and not on lighting, and therefore it is not possible to call them almost profitable.
In the sixties, the so -called fluorescent lamps began to actively use, which already have their distinctive positive qualities. Of course, the fluorescent lamps are beautiful, and inexpensive, and can produce a lot of light, and close in composition with sunny, so the fluorescent lamps are often called sunlight lamps, but they have two disadvantages. This is that although they are extremely economical, they can serve for decades, consume little electricity, but they are still dangerous for the environment, as they contain mercury, and yet a new generation of lamps called LED lamps appeared. I must say confidently that the LED lamps will be in the twenty -first, and most likely in the twenty -second centuries. After all, these lamps are completely new, which humanity simply did not know before. They can consume little electricity, and one hundred percent of the consumed electricity goes to lighting, and not to heating the light bulb. In addition, this kind of lamps are simply perfect for use in public places, since LED lamps consume little electricity, which means they can burn for a long time and with minimal electricity costs.
It should be noted that LED lamps are now used for lighting houses and for lighting streets, and more and more often they are chosen in order to illuminate housing. Thus, although the LED lamps can be and are more expensive than ordinary incandescent lamps ten times, but they work five years, instead of the year of the standard time of incandescent lamps, they consume one tenth of the energy that is needed to successfully operate the incandescent lamp, and of course LEDs The lamps are environmentally friendly because they do not contain mercury.