The power of a lamp is measured in lumens. This is in fact the measurement of luminous flux.
This measurement is made using an integrating sphere (or integrating sphere). Unfortunately, this material is very expensive and cumbersome to the point that virtually no one has to. Moreover, it is always better to announce commercially fanciful numbers highly exaggerated compared to reality, and it is clear that most manufacturers and distributors do not deprive themselves.
Some are content with very optimistic theoretical estimates, but others have no qualms to announce figures devoid of any technical basis. Some make the effort to clarify that the advertised power corresponds to the level of the led and not in the lamp output, but even in this case the announced figure is generally exaggerated.
Indeed, many things affect the amount of light actually emitted by a LED, and most of them are too often ignored when commercial interests are at stake:
The bin of LEDs that determines its performance, ie the amount of emitted light power consumption (electric) equal. Tint: generally equal power consumption, the amount of light emitted is even more important than hue is cold. LED temperature, which heats enormously gold operation, the efficiency of an LED is even worse as the temperature is high. The theoretical figures are usually based on the ambient temperature, which is completely unrealistic under normal use (as opposed to a laboratory test with a specific cooling system).
To all this must be added the losses caused by the reflector and the lens, on the order of 15%, and the current actually supplied by the control circuit, sometimes much less than the current advertised.
The figures in lumens should therefore under no circumstances be taken into account but is subject to the greatest distrust because they often reflect a desire to mislead potential customers about the real power of a lamp.
The only way to objectively estimate the power of a lamp is to compare it with that of another lamp, either directly or via photo beams ( “beamshots” in English), provided of course that these pictures were made in the rules of art, under conditions and with identical settings. Power is one thing, maintaining the power as and as battery or batteries discharge is another.
The incandescent light bulb that lights the old team is satisfied with the bare minimum to run: a power source and a switch to turn on / off the lamp. The counterpart is that the power decreases gradually along with the batteries discharge.
An LED requires a control circuit whose role is to regulate the power supplied to the LED, and can provide multiple power levels, flashing modes …
Good regulation can maintain a stable power regardless of the discharge batteries or accumulators but its disadvantage is that once the batteries / rechargeable batteries are empty for flashlights according to Garyflashlights, the lamp turns off suddenly, without any warning. This operation can pose serious problems as the situation where we are when that happens.
The ideal is a regulation that maintains constant power but warns one way or another that the batteries / rechargeable batteries are almost empty . This warning may be flashing, the automatic switch to a lower power level, or the gradual loss of power, in order not to be surprised by a sudden extinction.
Of course, it is also legitimate to prefer a power which decreases along with batteries / rechargeable batteries are discharged, not least because this type of regulation generally provides more autonomy and leaves plenty of time to replace the batteries before that they are completely empty.
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