What does 3k 4k stand for on the led lamp?

The color temperature of LED is expressed by absolute temperature k, that is, when a standard blackbody is heated to a certain extent, the color begins to change from crimson-light red-orange yellow-white blue. When the color of a light source is the same as that of the blackbody, the blackbody is the light source with absolute temperature at that time.

The color temperature of light source is different, and the light color is also different: the color temperature is below 3300K, and red gives people a warm feeling; Have a steady atmosphere and a warm feeling; The color temperature is between 3000-6000 K, and people have no obvious visual and psychological effect in this color, but have a refreshing feeling; So it is called "neutral" color temperature; The color temperature exceeds 6000K, and the light color is blue, giving people a cold feeling. Want to know more about LED, you can pay attention to the official account of WeChat.