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Let there be light! (c)

by admin

There is not a single area in our world where scientific and technological progress has not looked. Auto milking milkers, robotic vacuum cleaners and auto-washing urinals are firmly in our lives 🙂 Especially such a necessary thing as a light bulb NTP is constantly upgrading. So let’s start in order …

Incandescent bulbs

Practically the longest living bulb in our chandeliers and floor lamps, which is not long to wear out our eyes and electricity meters. The reason for that is low efficiency – 10-20 lumens per watt, a limited glow spectrum tungsten filament, which try to correct different sputtering of the bulb and relatively short life (although modern enough for a year). I hope that there is no point in telling about the principles of this dinosaur.

Luminescent lamps

Gas discharge, arc discharge, etc. The main difference from the incandescent lamp is that the main light flux is not generated by the tungsten filament, but by the glow of the internal medium under the action of the breakdown. As a rule, the light thus requires filtering for the human eye, so all such lamps have an internal sputtering that cuts off the unwanted spectrum (eg UV) and removes the emission peaks unpleasant to the eye. High efficiency (40-50 lumens per watt) compared to incandescent lamps and longer life leads to the gradual replacement of these lamps in homes. The only obstacle why they have not displaced the "normal bulbs" is in 10-20 times higher cost, which is caused by the complexity of the lamp and the scheme of its "inclusion" in the operating mode.

LED sources

Very economical sources of LOW power up to 70 lumens per watt (although there are exceptions ). In fact, they have already completely displaced incandescent bulbs from portable light sources. Modern LEDs are quite durable, but finicky about current operating parameters. Although the luminosity drops with lifetime, it is not so important for flashlights. These sources are still more expensive than luminescent lamps of the same luminous intensity because they are assemblies of several LEDs and rectifier circuits to prevent failure.

Microwave discharge sources

These sources were developed as far back as 1992, but the high price at the time led to low prevalence. The principle of operation of such a source is the following: resonator inside the special bulb, not letting out microwave radiation, causes luminescence of sulfur-containing gas inside, outside of the bulb the light is led by a light guide. Such lamps have many advantages:

  • -generates optimal light for human eye -the spectrum power distribution nearly matches the sensitivity of human eye
  • -Economic just over 100 lumens per watt
  • -Long life – tens of thousands of hours
  • -Luminosity is actually linearly dependent on microwave pumping power

But alas, for now they are used only in really powerful devices – more powerful than kilowatt (imagine luminous flux at 100 Lm/W), respectively lamp is heated to very high temperatures… Although there are precedents , and we will soon see these lamps in our daily lives.
P.S. Personally, I have already felt the benefits of "economical" lamps, after replacing all the bulbs in the house on the "economical" electricity bill decreased exactly in half, which leads to a payback of one such lamp for 0.5-1 months.
P.P.S. Quite possible inaccuracies and mistakes, I am open to criticism 🙂

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