Chapter 6 Deploying Wireless Networks for FortiOS 5.0 : Introduction to wireless networking : Security : Power
  
Power
Reducing power reduces unwanted coverage and potential interference to other WLANs. Areas of unwanted coverage are a potential security risk. There are people who look for wireless networks and attempt to access them. If your office WLAN is receivable out on the public street, you have created an opportunity for this sort of activity.