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Visible Light Perception

By the Human Eye

One potential consumer objection to window film is the darkness of the film. A common perception is that if a window film transmits 35% of visible light it must keep out or reduce visible light by 65%. Nothing could be further from the truth.
Some reduction of excessive visible light actually improves vision as too much visible light creates eye straining glare.
While window film does reduce a percentage of visible light, the human eye does not perceive the reduction like a Spectrophotometer (testing device) does. When determining the specifications for window films please review the measured VLT of the film against the perceived amount of light that the human eye typically sees, shown in the graph below.
Understanding-Visible-Light-infographic

Perceived Light Measurements

Interpreting the Graph

Measured VLT 100% – VLT Perceived by the human eye 100%
Measured VLT 80% – VLT Perceived by the human eye 90%
Measured VLT 60% – VLT Perceived by the human eye 82%
Measured VLT 33% – VLT Perceived by the human eye 68%
Measured VLT 18% – VLT Perceived by the human eye 55%
Measured VLT 14% – VLT Perceived by the human eye 49%

As you can see, the human eye only perceives about half of the total reduction of measured visible light. Some reduction of excessive visible light actually improves vision as too much visible light creates eye straining glare. Reducing glare improves the eye’s ability to focus on an object clearly, enhancing depth perception. The human eye reacts much like the lenses of a camera, opening up to allow more light in to generate vision. Compared to conventional window films, advanced solar window films allow for a great amount of visible light while controlling unwanted solar energy.