UV filtering glass for HQI

[scuglass]

This is why I ask.
http://www.reefland.com/forum/lighti...shielding.html
http://www.aquarium-design.com/reef/uvlighting.html

From hellolights

Q. What kind of glass should I use to shield this bulb?
A. Most regular glass will filter out UV rays. Of course, we are not glass experts, so we recommend that you go to your local Hardware Store, Glass Shop or Frame Store to find out which glass will filter the most UV. You can use tempered glass, since HQI type bulbs burn at a very hot temp, but are not required to.

There has been tonnnnns of discussion but no one seems to have answers....

Are the shields on the halogen lamps uv protected?