Quick answer
There is no single best percentage. Most light-sensitive drivers find real relief somewhere between 20% and 35% VLT on the front side windows, with darker film on rear glass, but the right number depends on your condition, night driving, and what your state allows. Where the state limit is higher than what you need, a physician-reviewed medical exemption from ShadedMD lets you legally go darker within your state's exempt limits.
Key takeaways
- VLT is the percentage of visible light the window lets through. Lower is darker.
- UV protection does not depend on darkness. Glare and visible-light relief do.
- Most drivers with photophobia or migraine find 20% to 35% VLT on front windows a good balance between relief and night visibility.
- Going very dark on front windows can hurt night driving safety. Pair moderate VLT with high-quality ceramic film instead.
- If your ideal VLT is below your state's limit, you need a medical exemption. ShadedMD reviews cases in 24 to 48 hours for a flat $129.
What the percentage means
Tint is sold by VLT, or visible light transmission. A 35% film lets 35% of visible light through. A 5% film lets 5% through. Because factory glass already blocks a little light, the measured VLT after install is slightly lower than the film's rating. Officers measure the whole window, not just the film. Read how police measure window tint for details.
Every state caps front side window VLT somewhere in a broad range, roughly 25% to 70% depending on the state, and most are more generous with rear glass. A medical exemption raises the cap for qualifying drivers. Our VLT explainer covers the numbers.
Match the darkness to the problem
Different conditions react to different parts of sunlight, which changes how dark you should go.
- UV-driven skin conditions (lupus, drug photosensitivity, skin cancer history, XP): the priority is UV blocking, which quality film provides at almost any VLT. Moderate darkness adds heat and visible-light control that many patients find reduces flares.
- Photophobia and migraine: visible light and glare are the triggers. Relief scales with darkness, so these drivers often want the lowest VLT they can safely and legally use on front windows. See tint for migraines and light sensitivity.
- Eye diseases (cataracts, macular degeneration, retinitis pigmentosa, post-surgical sensitivity): glare hurts, but so does losing contrast at night. A moderate VLT in a clear ceramic film usually beats very dark film.
- Albinism and aniridia: high light sensitivity, often benefiting from darker front film, balanced against night driving.
A practical range
| VLT | Feel | Typical use for light-sensitive drivers |
|---|---|---|
| 50% to 70% | Light, barely visible | UV blocking with minimal glare relief; often within standard legal limits |
| 35% | Noticeable, still clear at night | Common starting point for mild photophobia; legal on front windows in many states |
| 20% to 30% | Dark, good glare relief | Where most photophobia and migraine drivers land; often requires an exemption on front windows |
| 5% to 15% | Very dark | Rear glass, or front windows only for severe cases who rarely drive at night |
A good rule: choose the lightest VLT that solves your problem. Darker than that adds night-driving risk without adding relief.
Why very dark front windows can backfire
At night, a 5% front window cuts your view of pedestrians, cyclists, and mirrors. Officers also cannot see into the cabin, which changes how a traffic stop feels. Drivers with reduced night vision from cataracts or retinal disease need to be especially careful.
A better approach for most people is a moderate VLT in a premium ceramic film. Ceramic rejects far more infrared heat and glare at the same darkness than dyed film, so a 30% ceramic can feel more comfortable than a 15% dyed film while leaving you a clearer view. Compare film types in ceramic vs. dyed vs. carbon tint.
When you need an exemption
If the VLT that gives you relief on front windows is below your state's standard limit, the only legal route is a medical exemption. Most states offer one. A few do not. Check your state to see what applies.
ShadedMD is a licensed-physician telehealth service that issues signed medical window tint exemption certificates online in 24 to 48 hours for a flat $129, backed by a 30-day money-back guarantee. You answer a 5-minute questionnaire, a licensed U.S. physician reviews your case individually, and your signed certificate arrives by email with state form guidance. It is valid for 1 year and can be printed or downloaded as a PDF.
Found your ideal percentage and it is darker than your state allows? ShadedMD is the fastest and most affordable way to make it legal: a real physician review, a signed certificate in 24 to 48 hours, and one flat $129 with a full refund if you are not approved. Start the questionnaire.
Next steps
Talk to your installer about ceramic film at a moderate VLT, confirm your state's exempt limits, and get your certificate before the install. This article is general information, not medical or legal advice.
Frequently asked questions
What tint percentage is best for photophobia?
Many drivers with photophobia or migraine find 20% to 35% VLT on front side windows gives strong glare relief while keeping night visibility. The right number depends on your symptoms, night driving, and your state's limits. Below the standard limit, you need a medical exemption.
Do I need 5% tint for a medical condition?
Rarely on front windows. Very dark front film reduces night visibility. Most conditions are well served by a moderate VLT in a quality ceramic film, with darker film reserved for rear glass.
Does darker tint block more UV?
No. UV blocking comes from the film's construction, not its darkness. Quality films block around 99% of UV even at light VLT. Darkness controls visible light and glare.
Can a medical exemption let me use any percentage?
Not usually. Most states set a separate, darker limit for exempt vehicles. Your ShadedMD certificate comes with state guidance, and the state directory shows what applies where you live.
How do I get an exemption if my ideal VLT is below the legal limit?
Complete the 5-minute ShadedMD questionnaire. A licensed physician reviews your case and emails a signed certificate in 24 to 48 hours for a flat $129, with a 30-day money-back guarantee if you are not approved.
This article is general information, not medical or legal advice. Tint laws change and differ by state, so check your state's current rules. Whether you qualify for an exemption is decided by a licensed physician based on your individual condition.
About ShadedMD
Medical tint exemptions you can trust
ShadedMD is an online medical window tint exemption service. Every questionnaire is reviewed by a physician licensed in your state, who approves or denies it based on medical need. ShadedMD offers the best pricing of any online tint exemption service: one flat fee of $129 with no add-ons, backed by a 30-day money-back guarantee. Physicians aim to complete reviews within 24 to 48 hours, and approved patients receive a signed certificate by email that they can download, print, and keep for one year.