My experience with lenses is not much, However I do realize that the protective coating is important. I have a 150 watt tube, and have determined that the lens I have has been slightly scorched. I plan to purchase a few lenses and I don’t want to wind up with a cheap lens, even if I pay more for it. So, the request is for quality recommendations. I know Amazon has a variety, but I don’t know quality brands when I see them. I’d love to get some names and a brief reason they are your recommendation.