LED bulbs: trying to figure out the equivalent

    Most buyers of LED lamps are guided by the equivalent of an incandescent lamp. They roughly represent how a 40-60 or 95-watt lamp shines and select LED lamps based on this. And then miracles begin. All manufacturers indicate completely different equivalent values. More than 500 LED lamps have already been collected on lamptest.ru and the picture looks very funny.




    For conventional bulb lamps, manufacturers indicate the equivalent of 60 W for luminous flux values: 450, 500, 510, 525, 530, 540, 560, 570, 580, 600, 620, 630, 650, 680, 700, 720, 807 Lm. Such a good run almost twice!

    For the "candles" is still more fun. Manufacturers indicate the equivalent of 40 watts for luminous flux from 250 to 480 lm.

    If you take, for example, a luminous flux of 470 Lm, you can see that different manufacturers indicate the equivalent of 40, 45, 60, and even 75 watts for it.

    I note that all these are not measured values, but the data that manufacturers cite on lamp packages.

    So where is the truth? And what is the correspondence of the luminous flux and equivalent is true?

    It would seem a simple task is not at all simple. I measured the parameters of several tens of incandescent lamps and came to the following conclusions:

    1. The luminous flux of incandescent lamps very much depends on the voltage in the network. For example, an OSRAM lamp of 60 W gives 710 Lm indicated on its packaging at a voltage of 230 V, and at a voltage of 220 V it gives only 616 Lm.

    2. The vast majority of incandescent bulbs of any brand, even at a nominal voltage of 230 V, give a significantly lower luminous flux than specified by the manufacturer. For example, a GE Classic A50 / 60W-230V-F-E27 lamp at 230 V gives a total of 556 Lm, while a Philips A55 frosted 230V E27 ES 60W gives a total of 614 Lm, although both lamps have a luminous flux of 710 Lm.

    3. The dependence of luminous flux on power consumption is very different for different types of lamps. For pears, candles and balls, the ratio is 9-14 Lm / W, for mirror lamps R39, R50, R63 6.4-7.7 Lm / W, for spots GU10 and GU5.3 - 6-9 Lm / W, for microlamps G4 and G9 - 9.2-10.3 Lm / W.

    4. Incandescent lamps working with overheat. Such lamps give more light than stated, but do not last long. They can easily be recognized by a color temperature that is significantly higher than stated.

    There are several standards for determining the equivalent, but they are all far from reality. For example, in one of the European standards it is believed that 60 W is 806 Lm, only a single 60-watt lamp will never give so much light in real conditions.

    I believe that the equivalent should be determined on the basis of conditions that are as close as possible to real ones. According to the standard, we have 230 volts in the network, but in most houses the voltage is closer to 220 V. When buying LED lamps, we want to replace with them ordinary incandescent lamps that are sold in stores, and not ideal lamps that give exactly as much light as is written on the package which buy is unlikely to succeed. Therefore, to determine the equivalents, I take medium incandescent bulbs (not the worst and not the best in terms of luminous flux), operating at a voltage of 220 volts.

    I got the following equivalent values:

    Pears, balls, candles:
    15 W - 80 Lm
    25 W - 180 Lm
    40 W - 330 Lm
    60 W - 550 Lm
    75 W - 750 Lm
    95 W - 1100 Lm

    Mirror lamps R39, R50:
    30 W - 160 Lm
    40 W - 230 Lm
    60 W - 360 Lm

    Mirror lamps R63:
    40 W - 250 Lm
    60 W - 400 Lm Spotlights

    GU10, GU5.3:
    35 W - 280 Lm
    50 W - 360 Lm

    G4, G9 halogen light bulbs:
    10 W - 100 Lm
    48 W - 500 Lm



    Of course, the data are not enough, but what is there, that is.

    Since the equivalent for the reasons described above may not be accurate, I think that on the site it should be rounded to 5 watts. Perhaps the easiest way would be to create a table with ranges of luminous flux values ​​for each equivalent and each type of lamp.

    Data on lamptest.ru is downloaded from a CSV file obtained from the original Excel file. It would be great to write in Excel a grand formula that, depending on the type of lamp and the measured luminous flux, would calculate the value in the equivalent field.

    If you know Excel well and are ready to write such a formula, I will be very grateful. The source data file is here: lamptest.ru/led.xls

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