Visual light transmission, or VLT, is the amount of visible light that passes through a lens. It ranges in wavelength from approximately 400 nanometers (4 x 10 -7 m, which is violet) to 700 nm (7 x 10-7 m, which is red). Visible light is radiant energy in the wavelength range of 380 nm to 780 nm with Ill. D65 and CIE 2° observer. There is, however, one little complication, and that is that windows as installed by the factory do not allow 100% of light to pass through. A 5% VLT film is very dark as it only lets though 5% of visible light and a 70% film is very light as it lets through 70%. It is also known as the optical spectrum of light or the spectrum of white light. The visible light spectrum is the section of the electromagnetic radiation spectrum that is visible to the human eye. Well, in simple terms the VLT value is the percentage of visible light that will be allowed to travel through the window tinting film from the exterior face side of the film to the interior side. Visible transmittance, or daylight transmittance, is the percentage of visible light striking the glazing that will pass through. Visible light transmission is the amount of visible light that passes through the glass of your car window — which is similar to the level of darkness your film has, but each has several differences. Visible transmittance values account for the eyes’ relative sensitivity to different wavelengths of light. The VLT of window film is a crucial part in determining how much heat protection, UV protection and security protection you will get. Essentially, that equates to the colors the human eye can see. Listen to this. The lower the VLT percentage, the darker the tint isand the more outside light it blocks. If your windows can let in more natural light, you won’t have to rely so heavily on artificial light to brighten up your home. The proportion of light transmitted by glazing is specified by the Visible Light Transmittance, which is recorded as either TVw (visible transmittance of the window) or VLT (visible light transmittance). Therefore, it only blocks 30% of the sun. Poor window design can reduce the amount of daylight entering your home. This means that a 5% film will only allow 5% light travel through and a 70% film will allow 70% light to travel. In the simplest terms, the lower the percentage, the darker the window film will be. Visible transmittance can also help you save money. Glazing with a high visible transmittance appears relatively clear and provides sufficient daylight and unaltered views; however, they it For example, if you apply a tint of 70% VLT, it allows 70% of sunlight to pass through your windows. You’ll be able to have the lights off for a longer time when your window’s VT is higher. What Is VLT- Visible Light Transmittance? For instance, a lens with a VLT of 12% allows 12% of light to shine through and blocks 88% of it.
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