Most buyers of LED lamps is guided by an equivalent incandescent lamp. They are approximately as shining 40- 60- or 95-watt lamp and LED lamp is selected on this basis. And here begins wonders. All manufacturers indicate quite different meanings equivalent. On the lamptest.ru collected data is already more than 1,700 LED lamps and the picture looks very funny.
For conventional tubes, pears manufacturers indicate equivalent of 60 W at the values of the luminous flux 450, 500, 510, 525, 530, 540, 560, 570, 580, 600, 620, 630, 650, 680, 700, 720, 807 lumens. A good run almost twice!
For the "candles" still fun. Manufacturers indicate equivalent of 40 watts for the light flux of 250 to 480 lumens.
If we take, for example, the luminous flux of 470 lumens, you can see that different manufacturers indicate to him the equivalent of 40, 45, 60 and even 75 watts.
Note that all this is not the measured values and the data that manufacturers lead to lamp packages.
So where is the truth? And a line of luminous flux and the equivalent is true?
It would seem a simple task is not easy. I measured the parameters of several dozen bulbs, and came to the following conclusions:
1. The luminous flux of incandescent lamps is highly dependent on the supply voltage. For example, the lamp OSRAM 60W gives 710 lm, indicated in its package, at a voltage of 230 V and at a voltage of 220 V it gives only 616 lumens.
2. The vast majority of incandescent lamps of any brand, even at nominal voltage 230 gives significantly less light output than specified by the manufacturer. For example, the lamp GE Classic A50 / 60W-230V-F-E27 at 230 gives only 556 lumens, and Philips A55 frosted 230V E27 ES 60W - 614 lm, although both lamps specified luminous flux of 710 lm.
3. The dependence of the luminous flux of the power consumption is very different in different types of lamps. In pears, candles and balls 9-14 operates ratio Lm / W, a reflex lamp R39, R50, R63 6.4-7.7 lm / W, and y spots GU10 GU5.3 - 6-9 lm / W, y mikrolamp G4 and G9 - 9.2-10.3 lm / W.
4. Across the incandescent lamp, working with overtempered. These lamps produce more light than claimed, but not last long. They can be identified by the color temperature far exceeding the declared.
There are several standards for determining the equivalent, but they are far from reality. For example, in one of the European standards it is considered that 60 W is 806 lumens, that's just not one 60-watt bulb will never give as much light in the real world.
I believe that the equivalent should be determined on the basis of the conditions as close to real. As standard in our network of 230 volts, but most of the houses closer to the voltage of 220 V. When buying LED bulbs, we want to replace their incandescent bulbs, which are sold in stores, not ideal lamps giving it as much light as it is written on the packaging which is unlikely to buy out. Therefore, to determine the equivalents I take the average incandescent bulbs (not the worst and not the best of the light output), operating at a voltage of 220 volts.
I have the following value equivalents:
Pear, balls, candles:
15 W - 80 lm
25 W - 180 lm
40 W - 330 lumens
60 W - 550 lm
75 W - 750 lm
95 W - 1100 lumens
Reflector lamps R39, R50:
30 W - 160 lumens
40 W - 230 lm
60 W - 360 lm
R63 reflector lamps:
40 W - 250 lm
60 W - 400 lm
Spotlights GU10, GU5.3:
35 W - 280 lm
50 W - 360 lm
Halogen mikrolampy G4, G9:
10 W - 100 lm
48 W - 500 lumens
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