About Visual Light Transmission or "VLT"

When reading through the descriptions and technical specifications of the Apex line of solar control,
automotive, and tinted security films you will often see a "VLT" rating for the window film.
VLT stands for "Visible Light Transmission" or sometimes referred to as visible light transmittance.

VLT is a window industry term that refers to the amount of visible light that passes through a
glazing system, (in this case window film) and is expressed as a percent. A lower VLT rating tends
to be better for glare control, while a higher rating is preferred for maintaining natural light.

VLT General Rule of Thumb: The lower the VLT number the darker the film!

VLT Spectrum Comparison Chart

vlt-chart-800.jpg

The chart above will help you compare the amount of light that will be blocked by your solar, automotive
or tinted security films.

PLEASE NOTE: VLT only refers to visual light and does not effect Ultraviolet blocking qualities of window film.
In fact, even our highest VLT films still block more than 98% of UV rays. While there does tend to be a relationship
between visual light transmission and total solar energy rejection (TSER), Apex offers a variety of window films to
optimize light transmission and heat rejection.

To compare DIY solar control window film technical specifications, please click here.

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