Sunday, September 29, 2019

How to read LED parameters?

The three parameters of LED are mainly brightness (lumen), color temperature (Kelvin) and light type.
Lumen value is closely related to brightness.
Generally, the higher the lumen value, the brighter the lamp. Many merchants will advocate high lumen value to prove that the product is bright, but in fact they have not tested and calculated the lumen value with the correct method.
In general, manufacturers use integrating spheres to comprehensively measure lumen values. However, lumen value is a test result and is affected by many factors.
Current magnitude, thin thickness of lampshade, calculation algorithm and so on all lead to great differences in lumen value, so it is incorrect to judge whether the lamp is bright or not and whether its performance is excellent based on a single measured lumen value.
The color temperature is not the higher the value, the better.
Color temperature is a unit of measurement that indicates that light contains color components. The natural light source in the daytime belongs to a higher color temperature. The human brain will be more energetic and the human eye will feel more comfortable under high color temperature illumination.
Therefore, this is also the reason why the color temperature of the headlights is closer to the natural light in the daytime.
The above picture can clearly feel the difference caused by different color temperatures to the eyes, and the color temperature 6000K is the most comfortable value relative to the eyes.
The color temperature of lamp products from major light source factories in the market can reach 6000K. 6000 K is the natural sunlight color temperature between hot sun and cloudy sky, which makes people feel very comfortable.
If the color temperature is higher than 6000K, the color of the light will be blue. If you drive under the lamp with high color temperature for a long time, your eyes will also have obvious discomfort.
The automobile light type refers to the angle and shape of the car headlights light.
A good light pattern has two important positive effects on headlights.
One is a clear light pattern cut-off line, which is a necessary guarantee for safe driving. If there is no clear cut-off line between light and shade, the light type is not only scattered but also not concentrated. What is more serious is that when meeting the driver, the driver will feel dazzling, shake his eyes and affect driving safety.
The second is that a good light pattern can illuminate a wider front road surface, and the driver will have a wider left and right visual field to discover people or animals that suddenly appear from both sides of the vehicle at night.
On the basis of satisfying a clear cut-off line, make the distance between 50m and 75m in front of the car as bright and clear as possible, which can help the driver to find obstacles earlier. The longer and wider the beam closer to the car head, the wider and better the irradiation range.
If you want to learn more about LED automotive lighting, please visit our website: https://vantenled.com or https://vanten.co.uk.

2 comments:

  1. Hi

    Does LED bulb operation in cars pose any health issues due to its electro magnetic radiation?

    ReplyDelete
    Replies
    1. It doesn't, the LED bulb should be pass the EMC(Electro Magnetic Compatibility) test. The EMC verfitied LED bulb is safe for human.

      Delete

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