One-way perspective window film turns on the light during the day. Is it spicy outside?

I would like to ask if you can see the one-way perspective window film outside when you turn on the light during the day. People outside can't see the room clearly.

One-way perspective window film is a special film material, which can protect visual privacy from the inside out when the lights are turned on during the day. Usually turn on the light during the day, so people outside can't see the room clearly. This is because the one-way perspective window film can use the refraction principle of light to scatter and reflect the line of sight from the outside to the room, resulting in blurred and distorted vision.

But it should be noted that the actual effect will be affected by many factors. Such as brightness and angle of light, quality and transparency of film, etc. In some special circumstances, such as when the outside light is bright or the film transparency is high, outdoor people may vaguely see some indoor outlines or images. So it can't be completely guaranteed that people outside can't see the room when the lights are turned on during the day.