When we are driving at night, the visibility of the driving lights is very important. It can help us recognize the road condition better and improve the safety of driving. The lumens and Lux of the driving light have important reference value for the performance of the driving light. But it is not the higher the value the higher the visibility, they all have a certain rule. This article will help you to answer the confusion.

Lumens

Lumens are a measure of luminosity. It is equivalent to “kilogram” for weight and “inch” for length. So by the lumen we can compare which light is brighter. We often see two lumens data on the product parameters, one is the raw lumen output and the other is the effective lumen output.

Raw Lumen Output

Many manufacturers use raw lumen data when describing the performance of their products. Because raw lumens is a theoretical value, it will be larger than the effective lumen output. This is because it is not affected by any external factors. It is the maximum potential brightness that a led light can achieve. Raw lumens are calculated by multiplying the maximum output power of each led light chips by the number of led in the fixture. For example, if the lamp has 10 led chips and each led has 500 lumens, then its raw lumen output will be 5000 lumens. So the original lumens may not be very accurate in the actual use, there is only a little reference value.

Effective Lumen Output

Effective lumens are calculated from the actual output of light. Measuring effective lumens requires specialized equipment such as an integrating sphere. This measurement takes into account losses due to optical design, light dispersion, lens quality and overall system efficiency.

In essence, effective lumens are a more accurate reflection of the actual performance of the light.Because in actual use, due to the thermal properties, the absorption and reflection of the lens and the way the device is assembled, more or less will affect the brightness of the led light itself, so the effective lumen can more accurately reflect the actual performance of the light.

Choose different lumen sizes according to your needs. It doesn’t necessarily mean that you need a light with a large lumen output. What suits you is the best.

Lux

Lux is a measure of light intensity. Lux measures the same amount of light, except it is the amount of light projected onto a surface. It helps us understand how well the light will perform in an application and is the best measurement for determining the brightness of the beam of light we are seeing. 1 Lux means 1 lumen per square meter, and the light is as good as just enough to read a book. As we move further away from the light source, its intensity becomes weaker.

In short, this measurement is used to determine the total amount of visible light and its intensity in a given space, usually expressed from the center of the angle of greatest luminous intensity.

Increasing lumens won’t help if the light can’t travel farther down the road. In fact, it can actually shorten your visible distance due to glare and near reflections. If the light output in the light plays in a narrower area, then we will feel that the light is very bright. If the light output is in a larger area, the intensity of the light will diminish. high lux light travels farther, while low lux light travels shorter. So lux is also an important reference value when buying products. Choose the right led car light according to the distance you need to illuminate.