Window tinting movies are measured in seen gentle transmission ranges (or VLT). Which means after we focus on a selected movie, be it for becoming to a automotive or every other utility, we usually seek advice from it with it is VLT worth. VLT is measured in proportion ( % ), so for those who hear a couple of tint product being known as a proportion, it’s the VLT that defines that proportion worth.
For instance, a tinting movie known as Charcoal 5% is a charcoal colored tint with a VLT of 5% and likewise a movie known as inexperienced 50% is a inexperienced colored tint movie with a VLT of 50%. However what does the quantity really imply?
Effectively, in easy phrases the VLT worth is the proportion of seen gentle that shall be allowed to journey by way of the window tinting movie from the outside face aspect of the movie to the inside aspect. Which means a 5% movie will solely permit 5% gentle journey by way of and a 70% movie will permit 70% gentle to journey. In impact, because of this decrease VLT movies will seem darker. For example, it’s usually 5% tints that we’ll see on limousines for privateness.
So, becoming a 5% tint to a window will permit 5% gentle to journey by way of the glass from exterior to inside, proper? NO! As a result of we have to take into accounts the precise VLT of the window earlier than the tint is even put in. There is no such thing as a such factor as a chunk of glass, irrespective of how clear it seems, with a VLT of 100%. It’s because glass naturally filters out a bit little bit of seen gentle.
Lets have a look at automotive window tinting as that is one space the place we converse of VLT usually resulting from the truth that many international locations have legal guidelines in place limiting how darkish automotive home windows needs to be tinted. Most fashionable vehicles come from manufacturing unit with home windows studying a VLT someplace between 72% and 78%, relying on producer, mannequin and nation. Say, our instance automotive’s home windows learn at 72% and we add a 50% window tinting movie, what’s the new and ultimate VLT of our automotive’s home windows after set up?
The sum may be very easy: V1 x V2 = V3 (The place V1 is the unique VLT of the glass earlier than tinting, V2 is the VLT of the window tinting movie and V3 is the ultimate VLT worth of the glass with tint movie utilized).
Our automotive’s home windows authentic VLT = 72% and the tint = 50 %, thus V1 = 72 and V2 = 50
The sum is 72 x zero.50 giving us 36, which we are going to categorical as a proportion. So a window with an authentic VLT of 72% will then have a VLT of 36% after utility of a 50% movie.