IR Pass Filter (Infrared pass, visible light cut, also named "Cold Mirror")
Apply:
The IR pass filter (Infrared pass filters) that operates over a very wide temperature range to reflect the entire visible light spectrum while very efficiently transmitting infrared wavelengths. So that can increase the temperature of bathroom.

 

IR Cut Filter (Infrared cut, visible light pass, also named "Hot Mirror" / IR blocking)
Apply:
1. The IR cut filter often employed to protect optical systems by reflection heat back into the light source.
2. The IR cut filter are crucial to CCD/CMOS of digital camera lens which are sensitive to infrared wavelengths,
... this filter could adjust the performance of sensor to human eye.