I'm trying to avoid the use of the blue 6000K lights and stick to the yellow 4000K. The human eye is more sensitive to yellow/green. It's also why I put a PIAA Plasma Ion Yellow on the motorcycle for the headlight
From:
https://www.olympus-lifescience.com/en/microscope-resource/primer/lightandcolor/humanvisionintro/
"In recent years, consideration of human color visual sensitivity has led to changes in the long-standing practice of painting emergency vehicles, such as fire trucks and ambulances, entirely red. Although the color is intended for the vehicles to be easily seen and responded to, the wavelength distribution is not highly visible at low light levels and appears nearly black at night. The human eye is much more sensitive to yellow-green or similar hues, particularly at night, and now most new emergency vehicles are at least partially painted a vivid yellowish green or white, often retaining some red highlights in the interest of tradition.
and
"Human visual perception of primary subtractive colors, such as yellow, can arise in one of two ways. If the red and green cone cells are simultaneously stimulated with monochromatic yellow light having a wavelength of 580 nanometers, the cone cell receptors each respond almost equally because their absorption spectral overlap is approximately the same in this region of the visible light spectrum.
From:
https://visual.ly/blog/the-use-of-yellow-in-data-design/
"The Opponent Process Theory of Color
Here’s how your brain takes the signals of light intensity from the cones and turns it into color information. To see red or green, your brain finds the
difference between the levels of excitement in your red and green cones. This is the red-green channel. To get “brightness,” your brain
combines the excitement of your red and green cones. This creates the luminance, or black-white, channel. To see yellow or blue, your brain then finds the
difference between this luminance signal and the excitement of your blue cones. This is the yellow-blue channel.
From the calculations made in the brain along those three channels, we get four basic colors: blue, green, yellow, and red. Seeing blue is what you experience when short-wavelength/high-frequency light excites the blue cones more than the green and red. Seeing green happens when light excites the green cones more than the red cones. Seeing red happens when only the red cones are excited by long-wavelength/low-frequency light.
Here’s where it gets interesting. Seeing yellow is what happens when BOTH the green AND red cones are highly excited near their peak sensitivity. This is the biggest collective excitement that your cones ever have, aside from seeing pure white. Notice that yellow occurs at peak intensity in the graph below. Further, the lens and cornea of the eye happen to block shorter wavelengths, reducing sensitivity to blue and violet light. This, combined with the neuronal nirvana resulting from the overlapping sensitivity of the red and green cones, is why yellow appears to be the brightest color in the spectrum, making it a unique and useful color.
