The JPJ regulation of a tint in Malaysia requires you to install a tint that has 70% VLT for the front windscreen and 50% VLT for the front windows.
However, with the front being bright, there is bound to be more heat coming into the car. What should the rest of the window darkness be?

In order to have good heat rejection inside the car, a dark tint is not the only factor. In fact, the sun rays come in 3 separate radiations.
Visible Light, Infrared and Ultraviolet. By having a dark tint, you are blocking out Visible light.
But you can still get a good quality tint to compensate for the brighter tint to comply with JPJ by choosing a tint that has good Infrared Rejection and Ultraviolet rejection.
Get a darker tint for the other windows!
We would usually recommend to follow the JPJ rules for the front windscreen and the front windows, and the rest of the car can be darker depending on your preference.
Sun’s heat comes in from all directions of the car, so having a darker tint at the back blocks out at least the rear portion of the visible light.
It is common to have darker tints for the windows that are not regulated in JPJ’s rules.

Get a good infrared rejection tint for the brighter windows.
If budget is a concern and you are not willing to spend more on tint for the entire car, you may even consider having an upgrade to a better quality tint for the front as sort of a countermeasure to balance the amount of heat coming into your car.
To find out more on how to choose a good infrared rejection tint, do check out this article here.
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