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Thanks very much for all your interest. I am happy with the brightness of my current low priced <5mw green laser, the beam is not bright enough to affect my night vision (provided I don't look directly into it :eek: ), but is initially nicely visible and gets dimmer as it cools until it is...

Thanks for your reply, but I know nothing about lasers and don't have a clue what DPSS means. Could you provide further details and links to where I can purchase one please.

I have green laser pointer attached and aligned with my telescope, which is a great help in locating objects. It is rated for use at temperatures above +10C and works fine until temperatures drop. I am currently building a heater using Nichrome wire around the pointer, but would like to know...