LibGDX - change the brightness of a texture

Hello folks,
I am trying to achieve a lighting effect, and for that i need to change the brightness of my textures / blocks.

However, everything works except the last part, how can i change the brightness of a texture in libGDX? and it must be performance friendly.

I searched this with my friend google, but he couldn’t find anything useful… or maybe i just a bad searcher…

Any ideas folks?
Thanks in advance and see you later programmers.