2 Problems with materials with Transparency ?

Guys, someone could tell me how I solve these two issues of materials with transparency ?

1 Question:
How to make the light (spot) make it incidence , ie the marking light on the mesh material having transparency. Realize that it is not the same incidence of light as it is on the wall.

Below is the video link that demosntra the problem:

2- Issue:
The away the camera to the transparency disappears as the distance .

Below is the video link that demosntra the problem: