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Good light formula to measure multiple layers of tint? 2x30%, 3x30%, 4x30%

CamperDan
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CamperDan

CamperDan

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Formula (around not perfectly accurate) is base film x next film % (keep going for multiple layers) then x2 gets approximate % of light passing through all layers.

 

Example. Three layers of 30% film would be about 5.4%

30x.3x.3x2=5.4%

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solved formula.
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CamperDan

CamperDan

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On 4/8/2023 at 12:02 PM, Tintguy1980 said:

Three layers of 30% VLT film using the simple formula and not a meter translates into .027, which is 2.7% VLT.

 

.3 x .3 x .3 = .027

 

Three layers of 30% VLT film added to 70% VLT glass produces a VLT of .0189 aka 1.89% VLT.

 

.3 x .3 x .3 x .7 = .0189

When I put 3 layers of 30% film together removing the clear plastic, the finished product almost exactly 5%, visually compared to single layer of 5% almost identical. I don't know if it's some type of polarizing where light passes through same places in design? For some reason I only achieved half the darkness putting layered film together from what the math says. Anyone with a light meter able to confirm. FYI 3 layers of Suntek CIR 30% was 5%. I can't explain it just is. I have several samples of 5% from different manufacturers to compare to. I'm not using a light meter. Anyone have a light meter to confirm the math?

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Bham

Bham

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@CamperDan You are trying to use visual comparison to override actual math.  This is like trying to disprove physics. 
 

Also you are viewing just layers of tint and are not including the “green glass” that the tint is usually applied to. Which usually meters from 70% - 74%

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Tintguy1980

Tintguy1980

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Say it like the sheriff from 'Cool Hand Luke': What we have here is, paralysis through analysis.

 

Ta da, you have just learned how the manufacturers achieve 5% limo.

 

Always keep in mind; the simple multiplication exercise will never be equal to a meter read.

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