This is due to the fact that a white LED is originally a blue-emitting 1nGaN substrate covered with a phosphor powder of a conversion material, which emits yellow light when excited by blue light. The result is a mixture of blue and yellow light, which appears to the naked eye as white light. Looking at the emission line of a white LED, it has two peaks, so there is no LED that really emits white light. Such devices are difficult to manufacture because LEDs are characterized by emitting only one wavelength of monochromatic light, whereas true white light requires multi-color spectral synthesis. Due to the process, including imported LEDs with more than ten yuan, there is also this problem. There is a color cast at the edge of the light spot, just how much.

  White LEDs have yellowish to purplish white light. The color temperature of common white light-emitting diodes is usually in the range of 6500K to 8000K.

Can other color LED light-emitting diodes be used instead of white LED light-emitting diodes?

  absolutely okay. However, it must be noted that due to the different normal working voltages of LEDs of various colors, and the difference is large, for example, the normal working voltages of red and yellow LEDs are only about 2V, while the normal working voltages of blue and green LEDs are closer to white LEDs. All are about 3V. Therefore, according to the working voltage of various tubes, the number of tubes connected in series or parallel must also be changed accordingly, or the resistance of the current limiting resistor connected in series must be changed, otherwise it may cause the LED to exceed the normal working current and shorten it. Its service life, serious and may even burn the LED. When using red or yellow LEDs, the number of LEDs connected in series should be increased, or the current limiting resistor in series should be increased; when using blue or green LEDs, generally only the resistance of the current limiting resistor can be adjusted.