Might be of interest - from "Telescopes & Astronomy" April newsletter:-
PROGRESS ON NEW "LEGAL" 1MW GREEN LASER POINTER
We have now been able to develop a Green Laser Pointer which will produce a beam using less than 1mW through high quality of manufacturing. The Lasers are also 2cm shorter than the standard models.
As light pollution determines how well a beam is produced, I will try to describe how well the new 1mW Lasers perform in various light polluted conditions.
10/10 Dark Skies (no light pollution) - no problems, the laser will produce a beam bright enough for pointing out stars to a person next to you. It is bright enough to be used a Finderscope for your telescope.
9/10 Still Dark Skies - no problems.
8/10 Darkness - our local forest is fairly dark. With no dark eye adaption, no problem seeing the beam and using it as a Finderscope.
8/10 Darkness - darker suburban lighting with dark eye adaption - no problem seeing the beam and using as a Finderscope.
7/10 Darkness - My house is located in the suburbs - I have a visible white street light 60m away, and more street lights further away. Full-on suburbia houses are 250m from my backyard, and houses line the street opposite me, out the front. I would call this darker than your average suburban house. With only 10mins dark adaption, the beam can be seen when using the laser for pointing out stars to someone next to me, or use as a Finderscope.
5/10 Darkness - Average Suburbia - with full dark adaption. No interruption from occasional car head lights. Difficult to see the beam going all the way up to stars.
2/10 City Skies - not a hope!
New 1mW Green Laser Pointer for Astronomy $100AUD.
WEB SITE:
http://www.telescopes-astronomy.com.au
EMAIL:
telescopes@adam.com.au