Comparison
TSER vs IRR vs VLT Explained
Three acronyms decide whether a film is good, legal, or just well marketed. Shops quote whichever flatters them most. Here's how to read them properly.
Short answer. VLT is how much visible light passes through — this is the number the law regulates. IRR is infrared rejection, usually measured over a narrow band, and it is the number shops advertise because it looks biggest. TSER is total solar energy rejected across the whole spectrum, and it is the only figure that reliably predicts how cool the cabin will be. Compare TSER at the same VLT.
| Metric | Full name | What it measures | Regulated? | Use it for |
|---|---|---|---|---|
| VLT | Visible Light Transmission | % of visible light passing through | Yes | Staying legal |
| IRR | Infrared Rejection | % of infrared blocked, often over a narrow band | No | Marketing — treat with caution |
| TSER | Total Solar Energy Rejected | % of total solar energy blocked | No | Predicting real cabin comfort |
| UVR | Ultraviolet Rejection | % of UV blocked | No | Skin and interior protection |
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VLT — the only number the law cares about
VLT is the percentage of visible light that gets through the glass and film together. Higher VLT means a lighter window.
Malaysian limits: at least 70% on the front windscreen, at least 50% on front side windows. Rear side windows and rear windscreen have no VLT limit for private vehicles.
Important: VLT is measured on the glass-plus-film combination, not on the film alone. Factory glass is already slightly tinted, so a 70% film on 85% glass gives roughly 60% combined — which fails. This is the single most common way a well-intentioned tint job becomes illegal.
IRR — the number on the poster
Infrared rejection figures above 90% are extremely common in advertising. They're often measured at a single wavelength, typically around 1,000nm, where rejection is easiest.
Infrared spans roughly 780–2,500nm. Blocking one convenient slice of that range and quoting the result as though it represented the whole is technically accurate and practically misleading.
TSER — the figure that predicts comfort
TSER accounts for visible light, infrared and UV weighted by how much energy each actually carries. It is the closest single number to 'how much cooler will this car be'.
Reputable manufacturers publish TSER per film series per VLT. If a shop can't produce that sheet for the exact series they're quoting, they're selling on price and hoping.
How to compare two quotes properly
Ask for: film series name, VLT, and TSER at that VLT. Three data points. Then compare like with like.
A film with 99% IRR and 45% TSER is worse than one with 85% IRR and 60% TSER. The bigger number is not the better film.
Frequently asked questions
Is TSER or IRR more important?
TSER. It measures total solar energy rejected across the full spectrum. IRR often refers to a narrow infrared band chosen to produce a flattering number.
What VLT is legal in Malaysia?
At least 70% on the front windscreen and 50% on front side windows. Rear side windows and the rear windscreen have no VLT limit for private vehicles.
Does the glass count toward VLT?
Yes. VLT is measured through glass and film together. Factory glass already reduces transmission, so film VLT and final VLT are not the same number.
What's a good TSER figure?
Compare within the quotes in front of you at matching VLT rather than chasing an absolute threshold. The useful question is which of these two films rejects more total energy at the same legal VLT.
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