What does the alpha-value in light-settings?

Maybe it is a very noob question. And i am very new to materials, lightning, etc.

I built a day-night-cycle with color gradient for my sun-light.
The color-gradient doesnt work without an alpha-gradient.
How does the alpha-value affect my light?
I do not see any difference if i change the light-alpha to 0.0f or 1.0f.
I am talking about the lights’ alpha. Not texture-alphas.

Thanky in advance.

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The alpha value is unused.

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