What does color_alpha do?

[jdbeatz]

I've been using SFM for a long time, and I still don't know what the color_alpha slider in the light's sliders does. Does anyone else know?

[surfer171]

Alpha is basically the degree of opacity of an object or the transparency of the object. Higher alpha means opeque while lower alpha means transparent.

In the case of color alpha is just the same (or so I think since I don't mess with it) lower alpha means the color of the light will give the color of the light a dimmer sort of shade while higher alpha is just normal

[Zappy]

For lights, it doesn't have any effect from what I can remember. It might have an effect if the light "gobo" is a texture with alpha, but even then it might still not have an effect.