Comprehensively elaborate the twelve LED performances to lead you into the LED world

July 09, 2020

To understand LED in depth, not only need to understand some basic knowledge of LED, but also understand the performance index of LED, because LED performance index is the core part of the whole LED. The author divides the LED performance index into 12 keywords. Let me analyze the netizens in detail below.

12 important LED performance indicators

(1) The color of LED: The color of LED is a very important indicator, and every LED related lamp product must be marked. At present, the colors of LED are mainly red, green, blue, cyan, yellow, white, warm white, Amber etc. This parameter must not be forgotten when we design and receive orders (especially for beginners). Because of the different colors, the relevant parameters also vary greatly.

(2) LED current : The forward limit (IF) current of the LED is mostly at 20MA, and the light decay current of the LED cannot be greater than IF / 3, about 15MA and 18MA. The luminous intensity of LED is only proportional to IF in a certain range. When IF> 20MA, the brightness enhancement can no longer be separated by the inner eye. Therefore, the working current of LED is generally reasonable at around 17-19MA. The preceding is for LEDs between ordinary low-power LEDs (0.04-0.08W), except for some piranha LEDs (some are rated around 40MA).

In addition to the continuous development of technology, high-power LEDs also continue to appear, such as 0.5W LED (IF = 150MA), 1W LED (IF = 350MA), 3W LED (IF = 750MA), and other specifications. I am different. Once introduced, you can check the LED manual by yourself.

(3) The voltage of the LED: Generally, the LED is a forward voltage, that is, the anode of the LED is connected to the anode of the power supply, and the cathode is connected to the cathode of the power supply. The voltage is related to the color, the voltage of red, yellow, yellow-green is between 1.8-2.4v. The voltage of white, blue, and emerald is between 3.0 and 3.6v. Here, the author should remind that there are some differences in the voltage of LEDs produced in the same batch. According to the manufacturer's provision, when the external temperature increases VF will fall.

(4) The reverse voltage VRm of the LED : the maximum reverse voltage allowed to increase. If the value is exceeded, the LED may be damaged by breakdown.

(5) The color temperature of the LED : Expressed as the absolute temperature K, that is, heating a standard black body. When the temperature rises to a certain level, the color starts to change from deep red to light red to orange to white to blue. When the colors are the same, the absolute temperature of the blackbody at that time is called the color temperature of the light source.

Because the correlated color temperature is actually the evaluation value of the light color performance of the light source when the black body radiation is close to the light color of the light source, it is not an accurate color comparison, so two light sources with the same color temperature value may still be in the appearance of the light color There are some differences. The color temperature alone cannot understand the color rendering ability of the light source to the object, or how the color of the object reproduces under the light source.

Correlated color temperature of different light source environments

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