a one-way light intensity of the side to see the light is weak, when the intensity of the glass film formed on both sides of the light, with one-way private effects, the strength of the greater the contrast, better contrast is small, private, private is weak. Affixed to the conditions of the same light, both sides can be seen.
Unidirectional perspective film all the indoor lighting at night, outside can see the interior!
[through] bidirectional glass film, line of sight is blocked, regardless of the light intensity, and can not see each other, day and night have good personal effect, mainly used for glass partition, bathroom, bathroom.
[in] night reflective indoor light, reflect light like a mirror! (glass itself will have a mirror, but will not reflect the light)