Darth Editous said:

[citation needed]

Is that adressed to my post ? Be sure I'd like to put my hand on this again. I'm 96% sure it was stated in GL's interview from this old mag:

... And I remember very well the words "blue laser" used for describing that technology. I always wondered how this would turn out. Hope some french collector could step in and confirm.

It would partially help to understand -perhaps- the lack of care those films have received since then, for every releases.