How to move along the brightness axis (adobe photoshop) in LESS color functions?

Question

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Hello.
color functions darken(); lightening(); in LESS allow you to move along the similar Saturation axis in Adobe Photoshop. And how can you move along the Brightness axis, by analogy with the same PS? For example, my color is #e5c545 and I want to give it a light shadow by shifting Brightness by 5% - #d9ba41

Answer 1

Here in this question I analyzed the ratio of Brightness and Ligntness:
How to get a translucent color in LESS, which on a white background will look like another non-transparent color?