After nearly 2 hours of searching i found this:
in data.lua:
data.raw["utility-constants"].default.chart.turret_range_color = {r = 1.0, g = 0, b = 0, a = 1}
data.raw["utility-constants"].default.chart.artillery_range_color = {r = 1.0, g = 0, b = 0, a = 1}
With this you can change the colors for the range of turrets and artillery.
But factorio uses other values for the transparency.
Even with the values from above the color for artillery is nearly invisible.