And the quote afterwards:
"*There are TWO LEDs that don’t seem to be ON and FOUR that seems to me that are dimmed, is this normal? YES – these LEDs are Infrared 850nm and UV 380nm- meaning that they are the type of lights of shorter or longer wavelengths that doesn’t excite our eyes‘ receptors — Therefore we can’t see anything beyond (infrared) or violet (ultraviolet) "