I have 2 Veileds. One is about 8 months and the other is about 3-4 months.
Wow this light is definetly older than 6 months!! Yikes I better get a new one now!! My little guy isn't doing great and this must be the problem.
They are made from aluminum screen and they don't have zippers.
I used Aluminum screen, so far i don't see the need to use 10.0.
As far as reptarium, many will recommend to use 10.0 since the plastic block some percentage of the UVB.
Be sure to raise it as high as the recommended height above the cage if you decided to use 10.0