This &quot;lightening&quot; and &quot;darkening&quot; you describe actually makes a lot of sense in terms of another way of connecting phycis and color, if we by &quot;lightened&quot; mean &quot;higher color temperature&quot;, and for &quot;darkened&quot; &quot;lower color temperature&quot;.<p>(Color temperature according to Wikipedia is &quot;temperature of an ideal black-body radiator that radiates light of comparable hue to that of the light source&quot;)<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Color_temperature" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Color_temperature</a>