SpriteBatch:setColor
Sets the color that will be used for the next add and set operations. Calling the function without arguments will disable all per-sprite colors for the SpriteBatch.

In versions prior to 11.0, color component values were within the range of 0 to 255 instead of 0 to 1.

In version 0.9.2 and older, the global color set with love.graphics.setColor will not work on the SpriteBatch if any of the sprites has its own color.
SpriteBatch:setColor( r, g, b, a )
r number The amount of red.
g number The amount of green.
b number The amount of blue.
a (1) number The amount of alpha.
SpriteBatch:setColor()