When we turn off the white light of the LED grow light and turn on the UV. From the picture, the LED that emits white light seems to emit a red light. This is because the phosphor is added to the white LED in the packaging process, and the ultraviolet light excites the phosphor.
![Excitation And Emission Spectra](https://vabira.com/wp-content/uploads/2021/08/Excitation-and-Emission-spectra.jpg)