what i read from thinkgeek is
green laser is about 50 timesbrighter than a red laser pointer and because of its unusual color it is much more noticeable. It has something to do with its 532 nm green laser wavelength whereas red has 650 nm. and the green beam itself can be seen in mid-air in dark conditions, not just the laser beam dot.
Tonite I bought 4 of'em in temple street. planning to have a star wars re-creation day
woooosh wooosh..
they cost me 150$ a piece, probably could've bargained down but didn't bother too much.
You can point it at the top of IFC2 from TST, to give u an extreme example for HK
doesn't get any cooler
Range of approximately 12,000 ft in darkness
uses:
survival tool. It's beam is so strong, rescuers and search personnel could spot you from 2 miles away if you were ever lost. The actual beam is visible in darkness (copy paste from a site)
blind pilots at short finals (enemy pilots that is)
entertain ur cats
annoy your farthest neighbors
show off to strangers
feel the force luke
and many more