Ok, I have found 2 glass stores in my area that know what Graylite 14 glass is. Apparently, there are only 2 shades of gray glass: (NOTE: What follows is all MY OWN UNDERSTANDING of glass, don't take it as fact!)
1) "gray glass" has a slight gray tint to it, but you can basically see right through it.
2) Graylite 14 or Dark Gray glass is extremely dark. Dark like tinted windows on a tricked out honda civic. I believe the 14 indicates that only 14% of light passes through it.
If you want the glass covering your cabinet's TV/Monitor to be pitch black when the cabinet is off, then you want graylite 14. If you want to see the picture tube when the cabinet is off, or if you want to see graphics, text on the bezel behind the glass, then just get clear glass. the regular "gray glass' just imparts a slight gray tone to everything which looks bad.
IMPORTANT NOTE : No matter what glass you get, always get TEMPERED or SAFETY GLASS! Regular glass breaks into many RAZOR SHARP pieces, while tempered glass breaks into small dull square pieces.
I'm still hoping that Darktemp will come back and let me know if he had to make adjustments to his TV's contrast, hue, color, or brightness to account for the dark glass over the picture tube. Darktemp???