I used a laser of the mark in 1984 !!!!! ......
it was a 6 watt argon model 95 ... if I remember good 5 colors in the blue-violet.
used in Corsica, in the first disco I bump as "light - jockey", the challenger in Ile Rousse. (which exist even today .. the site of Bernard Nicolas architect for some pictures or my profile)
I remember that was maintained daily for cleaning the filters at the water supply for cooling ...... because the flow would be rather important.
I possessed at the beginning a simple box-effect producing only 18 shots through referrals room .... then buying a b12 into 87 followed by a space mlb-24 laser, more interesting .
.... odds fiabilitee often broken, tube, glass was not very resistant to porosity and quickly saw the price of repairs, management had opted to buy a tube of many ceramic ... more resistant.
memories all the same nostalgia-nostalgia ......