When we are choosing lamps, we often see the term “lumen”. Do you know about it? At present, the most common lighting fixture is LED lamp. LED lamps usually make less energy, so they have a lower specified watt value, which makes the watt that we used to measure the brightness of LEDs no longer applicable, so manufacturers began to use lumens to identify the brightness of LEDs.
What is lumen?
Lumen, abbreviated as LM, is a logistics unit that describes luminous flux in international units. In physics, it is explained as the total luminous flux produced by candlelight in a solid angle. In fact, it can be simply understood as the brightness of a candle on a square meter. So the greater the lumen value, the higher the brightness. Measuring the brightness of the light source is more important than measuring its power. For example, the traditional incandescent bulb is measured in watts, which indicates how much power it uses. The higher the wattage, the brighter the light. With the emergence of more energy-saving lighting devices, wattage can’t fully represent the brightness of light unless it is the same type of lighting device. That’s why lighting is measured in lumens.
What is the difference between lumen and watt?
Lumen and watt measure different things, so they can’t be compared directly. That is, the measured values are completely different. However, it is possible to estimate the amount of lumens produced by LEDs with different wattages. For example, using an incandescent bulb with 100 watts of power produces about 600 lumens. When using LED bulbs, a 26-watt bulb can produce the same value of lumens. Lumen is also a useful unit when purchasing lighting lamps. In the past, only light and dark can be used to describe the light of the purchased lamps. Now, when you know how many lumens the bulb can produce, you can install or buy an accurate number of lamps.
How to measure the current value?
How can we tell what the lumen of a light is? This is only measured with special instruments. Like a light meter. The unit of lumen is lux, the English symbol is LX. 1 lux is equal to 1 lumen.
In the optical unit, there is another technical term, which is Candela. The English symbol is CD. It is also a unit of luminous intensity, and its relationship to lumens can be understood simply by using a flashlight. Lumens refer to how bright the flashlight is, while Candela refers to how far the light from the flashlight is emitted.
The higher the lumen, the brighter the light?
The answer is yes. There is a direct proportional relationship between lumen and brightness. The premise is that other factors are the same. But lumen is not the only determinant of brightness.
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