Categories: Sources of light, Energy saving
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The ratio of the power of lamps of various types

 

The ratio of the power of lamps of various typesThe range of lamps today is quite wide, and it is not at all surprising that someone may have difficulty choosing lamps. Someone still uses incandescent lamps, while someone has already switched to more economical compact fluorescent and LED lamps. Meanwhile, Federal Law No. 261 “On Energy Saving” significantly limits the possibility of using incandescent lamps in the future.

In order to help the consumer make the right choice, we compare the power of various types of lamps. Let us consider how the power of an incandescent lamp, a compact fluorescent lamp, and an LED lamp correlate with approximately equal requirements for the luminous flux emitted by them.

We will compare the following three lamps:

  • A 75 W incandescent lamp with a declared luminous flux of 935 Lm;

  • A compact fluorescent lamp with a power of 15 W with a declared luminous flux of 1000 Lm;

  • 9 W LED lamp with a declared luminous flux of 800 Lm.

Incandescent, CFL and LED lamp

Recall that the luminous flux is called one of the main parameters of the light source, which determines the power of the directly emitted light. The luminous flux in lumens (Lm) is measured.

Measurements to evaluate the light of lamps in order to correlate their power are carried out with a light meter. Light meter shows illumination, that is, the ratio of the light flux emitted by the lamp to the unit area illuminated by the lamp. So 1 lux (Lx) is equal to 1 lumen per 1 square meter. The number of lux determines the intensity of the light, that is, the direct illumination.

Light meter

For the experiment to determine the ratio of the power of the lamps, the table surface was chosen under the lamp, at a distance of 65 cm from it. The lamps were supplied with an alternating voltage of 220 volts.

Light meter measurement results:

  • 75 W incandescent lamp - 560 Lux;

  • Compact fluorescent lamp (CFL) with a power of 15 W - 389 Lx;

  • 9 W LED lamp - 611 Lux.

According to the results of measurements with a light meter, it is easy to see that the illumination is highest for the LED lamp, then there is an incandescent lamp, and, finally, a compact fluorescent lamp. Nevertheless, the power ratio is obviously in favor of the LED lamp, then comes the compact fluorescent lamp, and the incandescent lamp is the least efficient.

Since the luxmeter was measured in this experiment from the same distance, for the most objective assessment, we calculate the Lux / Watt ratio for each of the lamps, since the Lux / Watt ratio in this case is directly related to the Lumen / Watt ratio, i.e., with light output:

  • Incandescent lamp with a power of 75 W - 7.46 Lux / Watt;

  • Compact fluorescent lamp (CFL) with a power of 15 W - 25.93 Lux / Watt;

  • 9 Watt LED Bulb - 67.88 Lux / Watt.

From the experimental data, we can conclude the relative effectiveness of the three lamps considered:

  • LED lamp is 2.6 times more effective than a compact fluorescent lamp and 9 times more effective than an incandescent lamp;

  • A compact fluorescent lamp is 3.5 times more effective than an incandescent lamp, but 2.6 times inferior to an LED lamp.

  • An incandescent lamp is 3.5 times less effective than CFL, and 9 times less effective than LED.

Obviously, the LED lamp turns out to be the most effective, with a minimum power it gives better illumination. A compact fluorescent lamp is more effective than an incandescent lamp, but do not forget that such lamps contain mercury and require a special approach to disposal. And incandescent lamps rightly turn out to be a relic of the past, their efficiency is very low.

As a result, we can conclude that at the moment the best in terms of power consumption and light output LED lamp.

Comparison of the power of light bulbs made by various technologies (incandescent, compact fluorescent and LED):

Comparison of the power of light bulbs made by various technologies

See also at bgv.electricianexp.com:

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  • Types of lamp caps
  • The reasons for the flashing of a compact fluorescent lamp (housekeeper) and methods for solving ...
  • How are compact fluorescent lamps
  • How to choose a LED lamp

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    Comments:

    # 1 wrote: | [quote]

     
     

    The article is good, I liked it for determination with the choice of lamps is suitable, but I would like to ask the author to cover the problem of the impact on vision of each of the lamps examined. Nowadays, LED lamps have begun to appear a lot, but no one illuminates the effect of the light spectrum emitted by them on eye health.

     
    Comments:

    # 2 wrote: | [quote]

     
     

    1 The luxmeter measures the average over a specified period of time.
    2 CFL does not bring any savings, since Chinese CFLs from declared light values ​​to natural are, as they say, two big differences. Yes, and rarely serve more than 1 year. Although I will say in favor of branded. I had a Phillips lamp of 20 watts - I bought it in the mid-90s. I worked in my kitchen for 20 years! Flared up with a delay and smoothly. Color rendering somewhere around 3000.
    3 And now about the LED lamps. First, the principle of work. It is powered not by a constant smoothed current but by a PULSE high-frequency. What does it mean? and the fact that a larger instantaneous value of the luminous flux can be squeezed out of the crystal than with direct current. How does this affect vision? Flicker is very noticeable on moving objects! I have a vinyl player and the strobe is clearly noticeable. Yes, our eyesight is inertial, but the light is perceived as unpleasant. Also, in my corridor there’s a night light with a photocell, so it immediately responds to 1 incandescent lamp turned off, and to 2 LED Maxus of 10 watts, it first blinks, and after a while it calms down and turns off.
    Draw your own conclusions

     
    Comments:

    # 3 wrote: Marina | [quote]

     
     

    I agree with the author. We felt the difference between an incandescent lamp and an LED on your own wallet. We changed all the lamps in the apartment to LED and began to pay much less. On average, around the year, all the costs of the lamps paid off, and they all continue to work.

     
    Comments:

    # 4 wrote: | [quote]

     
     

    I have such a question, the article says that in the future, the law will ban incandescent lamps. But if an ordinary lamp costs 16 rubles, then the energy-saving 100 rubles. Again, the law is not in favor of the people. By the way, energy-saving very quickly burn out.

     
    Comments:

    # 5 wrote: | [quote]

     
     

    Let me make my five cents. For several years, the apartment used incandescent lamps, LED and energy-saving at the same time. So, the first and third constantly burn out. A LED pleased. So the future is definitely theirs!

     
    Comments:

    # 6 wrote: | [quote]

     
     

    It's time to switch to LEDs. Their light is much softer, and the savings are significant, if you take the charge for electricity - almost twice. It is worth spending money on a branded product so that it not only pays off, but also reduces the subsequent costs of electricity.

     
    Comments:

    # 7 wrote: | [quote]

     
     

    The measurements are not entirely correct. An incandescent lamp and a compact fluorescent lamp illuminate everything around, i.e. almost 360 degrees, only the base interferes, and LED only 120 degrees, that's where the gain comes from. Take a reflex lamp and compare.

     
    Comments:

    # 8 wrote: | [quote]

     
     

    Natalya87,
    Almost half the fee for the consumption of e / energy? That is, you have absolutely no energy-consuming appliances (kettle, electric stove, condo, etc.). Tell me, please, about the spectrum of non-incandescent lamps, about the dangers of their pulsating light (fluorescent and LED lamps are practically inertia-free) on vision. Olga, From the classic of V.V. Mayakovsky "Listen! If stars light up in the sky, then someone needs it!".For example, I had an incandescent lamp in the corridor (where frequent on-off) worked for as long as 20 years, only because it was fed through a trinistor scheme for smooth ignition (I am a radio amateur). Superbright LEDs operate at maximum currents (therefore, heat sinks - “radiators” are installed in such lamps) in a narrow emission spectrum. For thousands of years, the human eye has adapted to a wide spectrum of solar radiation. But the task for marketers is to convince people to "keep up with the engine."

     
    Comments:

    # 9 wrote: | [quote]

     
     

    I still do not understand. The article is bloated, as for a thesis. In short, how to determine the lamp in the old 100.150 and 200 watts. What are they comparable now in terms of illumination? Now what do not you take. It seems less light gives out than before a conventional 100W incandescent lamp.

     
    Comments:

    # 10 wrote: Andrew | [quote]

     
     

    Thanks Andrew for the useful article. I would like to add a comment from Protsenko Roman to your article: LED lamps sell with cool white, white, warm white, and other light. Perception is comfortable for a person’s eyes, warm white light close to an incandescent lamp. Often people buy cold -white glow, designed more for industrial premises. I recommend everyone to carefully read the packaging. Thank you.