Think about it - why is there a lack of response? It's because the light is low energy, which is why it is only effective at low levels and a sufficiently bright red light will kill your night vision. It's all about the energy.resynthesis wrote: ↑Fri Jul 09, 2021 4:36 amOT but red light is used at night due to the lack of response of rhodopsin in rods rather than its characteristic energy.
Again, the trigger isn't the colour, it's the energy it represents.The late night thing is related to the effects of light on melatonin production - blue light suppresses it.
Same thing - higher frequency equals higher energy. Think about a light bulb with a dimmer - at low energy levels the filament glows a reddish-orange colour but as you increase the energy more colours are added up the spectrum until you get pure white.It's frequency related rather than energy as I remember.