Answer 1: All one-way privacy films are designed for daytime privacy. Therefore, at dusk when the interior lights are on, window treatments/coverings (blinds, shades, etc.) are required to be drawn (just as with regular glass) to maintain nighttime privacy.
We mention this due to most door/entry glazings not having blinds that are able to be drawn closed at night.
Answer #2: Optimal one-way privacy is achieved when a room with windows only on one side (and a blank wall on the other) is tinted.
If there are other windows directly opposite the room to which the windows are being tinted, it can create a “light tunnel” through the room in which people from the exterior side of the building may be able see a shadowy silhouette of a person on the inside of the “light tunnel” between the two opposite windows/walls.
In situations where someone wants 24 hour privacy and has no window coverings, we also offer an opaque frost film product which enables light to transfer, but maintains privacy at all hours (including night time / after dark).