Calculating percentage of 2 layers of film?

[Guest pimpedout97x]

Is there a way to calculate this? for instance, if a window had 2 layers of tint, 15% and 35%, what would that be similiar to had it been 1 layer of darker film, vs 2 lighter films?

both films are the same exact brand from the same shop (Llumar)

[Guest Mo Evo]

Is there a way to calculate this? for instance, if a window had 2 layers of tint, 15% and 35%, what would that be similiar to had it been 1 layer of darker film, vs 2 lighter films?

both films are the same exact brand from the same shop (Llumar)

I've been wondering myself, how to do this. My Evo has 2 layers of 55% on the front roll ups and it's not even as dark as 35%.

[Graviteesfx]

I think the only exact way to measure would be to meter the window. Even with one layer different cars can meter out to different numbers with the same exact film on them.

[Guest tiger_football]

If I am not mistaken, you just multiply the VLT% of each film. For example, 15% and 35%; 0.15x0.35=0.05 (5%) then factor in the glass. Being in CA, a tint meter is useless (for autos) so I don't have one therefore I cannot empirically confirm this.

[Guest h0wld0g]

thats how it works and most standard stock windows clear read 77% so just factor that in there to and its easy as that

[Guest Crackz]

if 15% of the light is coming through the first layer and the second is 35% 15 will be your whole now your only going to let 35% of the light in from the 15% do the math and then thats your total it is 11.75 %

Edited June 16, 2008 by Crackz

[big money]

sounds like someone is trying to darken a legal tint job, why not just strip it and put 5 on it if you want it !llegal, unless you need the stickers that may be on there

[Guest hometheaterman]

Maybe he is trying to do double 5% or something like that. I've actually thought about doing that on a back glass of my truck but decided against it. 5% is hard enough to see out of.

[Guest tiger_football]

if 15% of the light is coming through the first layer and the second is 35% 15 will be your whole now your only going to let 35% of the light in from the 15% do the math and then thats your total it is 11.75 %

How did you get 11.75% with 15% and 35%?

[Guest Ace123]

This is easy.

most windows fall near a 80% VLT range stock.

so lets say I put on..... a 50%, and then that wasnt dark enough for the back of the station wagon, so I put on a layer of 35%.

Whats 50% of 80%..... falls at 40% range

Now whats 35% of 40% ..... 40 x .35 comes down to a 12.5 VLT

Now while this isnt exact, it sure gives you a good idear.