Laser Defences
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General Information 
The laser defence module is a defense measure that launches laser attacks against an incoming retaliator (an alien Battleship).
It is the end result of laser based research. A single laser defense system is roughly worth two missile defense systems, but only because it takes up less space inside your installation.
Statistics
Construction Time: 24 days
Construction Cost: $400,000
Maintenance: $10,000/month (see Maintenance costs)
Defense Value: 600
Hit Ratio: 60%