how to determine if usb alfa awus036h is 500mw or 1 watt

Ways to tell the difference between 500mw and 1W version of the awus036h:
from: http://forums.remote-exploit.org/general-discussion/28841-how-test-alfa-awus036h-500mw-1w.html (forums appear to be down now)

The Alfa 1000mW(1W) has a 1 in cased in a circle stamped on the front the 500mW does not
shine light on LED, the PCB will be blue