system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a difference in brightness between a light source emitting one colour and a light source emitting the same amount of photons but white?
gpt
If you are referring to subjectively perceived brightness, then there can certainly be a difference in brightness between a monochromatic light source and a white light source emitting equivalent numbers of photons. If the wavelength of the monochromatic source is around the peak of human sensitivity, around 555nm, then it would appear brighter than the white light source. Conversely, if the monochromatic source is emitting a frequency that is not well absorbed, then it would appear dimmer than the white light.