Many commercially available LED lights lack red light wavelengths, unlike natural light sources.

“there's no red light in there either exactly they are really blue green yellow sometimes even UV light right I mean the fluorescent lights in a in a department store for instance or in a pharmacy I haven't done the um spectral waveform analysis but you know those who have it's published it's out there there are a lot of data about environmental Occupational Health stuff — would show that it is the — the emission Spectra are severely tilted toward short wavelengths and there's hardly any red light in there whereas a candle for instance or a fire roaring fire roaring candle people ask that sorry to interrupt is almost all orange and red light right”