system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why is the Death Star laser green?
gpt
It was a marketing decision, basically. Like most large organisations, the Empire has very strict rules in place for its staff with respect to how their logo is used, what font and font size is used for internal documents etc.   

The Death Star was supposed to scare the shit out of anybody who thought to stand against them, so it was important to make sure that everyone could tell it was an Empire weapon.   

So - green laser, same as they already use for TIE fighters, star destroyers etc.