VLT, IRR, UVR, VLR — What Do Window Film Specs Actually Mean?
To choose window film that fits your needs, you first need to understand these 4 basic spec values.
1. VLT (Visible Light Transmission) — the percentage of visible light that passes through the film. The higher the number, the clearer and brighter the film; the lower the number, the darker and more private.
2. IRR (Infrared Rejection) — the percentage of infrared radiation blocked, a major contributor to heat buildup. The higher the number, the more it helps reduce infrared-related heat — always compare the manufacturer-verified figure for each specific model.
3. UVR (Ultraviolet Rejection) — the percentage of UV radiation blocked, relevant to skin protection and interior material fading. Check the manufacturer-verified figure for each film model.
4. VLR (Visible Light Reflection) — the percentage of light reflected off the film's surface. A high value gives a mirror-like shine that some find distracting; a low value suits those who want a clear, undistorted view.
How to choose: Weigh all 4 values together based on your priorities — want brightness? Look for high VLT. Want heat rejection? Look for high IRR. Want to protect your skin and interior? Look for high UVR. Don't want reflective glare? Look for low VLR.
