Well...if you want to put it like that, I'll put it like this:
For starters, usually it's a good idea to know the subject matter and have practical experience before telling someone with both they are wrong. You can worry all you want about the similarities in light spectrum with different bulbs, or you can accept that it (HPS) works just fine. All three types of bulbs (dual arc, full spectrum and 'regular') each have their plusses and minuses.

Were we not concerned with growing the best meds possible, we wouldn't be here dispelling rhumor, inuendo and bullshit. Were there any possibility of consequential damage, do you think anyone on any cannabis board would recommend it's use? Get a grip, and pull your head out. It is SERIOUSLY nothing to worry about, and your consistent slamming of the equipment has become laughable. What next...a warning that sunlight might be damaging to our cannabis plants...?

You keep repeating the chant about damaging light and spectrums, but you offer no alternative, and obviously are not absorbing the material offered. I've asked you this question before, but I'll try one last time.
What is your alternative?