''Finally, because LED costs remain comparatively high, it is important to protect these expensive modules with impact-resistant components. ''

Well I'll B - SWEET

''Improved-clarity PC technologies offer potential solutions to all these issues. Although polymethyl methacrylate (PMMA) and, to a lesser extent, glass, have traditionally been chosen for LED optical applications, both materials have drawbacks that these new PC materials avoid. Further, as LEDs continue to evolve and raise the bar on requirements for optical components, the high-performance attributes of PC accommodate new demands – higher temperature ranges, longer exposure to heat and tougher flammability requirements''

http://www.ledsmagazine.com/articles/print/volume-9/issue-12/features/improved-clarity-polycarbonate-resins-perform-in-led-lighting-applications-magazine.html

Diamond Guard; PMMA 9H and Beyond.
http://www.unipixel.com/diamond-guard-resin/

I'd be looking for some news on this down the road.

emit..