An example of astronomers using the green lasers is in the Northern Territory where you can have dinner out at Uluru, and for around 15min all the lights are turned off and astronomers show the constellations, etc. However, as there are no lights at all on, large spot-lights actually work better and can be seen better than a tiny green dot in the sky.
The green lasers are used for specific stars, and in more built-up areas where the spot-lights do not work as well due to other lights being on in the surrounds, at least that is what the astronomer told us when I was out there.
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One of those UNSW students... you know what I mean
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