UV Cameras: Can you Use them To Tell You if your Sunscreen is 'Good' or 'Bad'?
“UV cameras can help ensure complete sunscreen coverage—but cannot judge a sunscreen’s effectiveness. At The Sunscreen Company, our mineral sunscreens offer reliable, broad-spectrum protection based on the most up to date research and sunscreen science. No cameras needed.”
Don’t Judge this Sunscreen
At least not by your UV Camera- here’s why UV Cameras are limited in what they can tell you
Do UV Cameras Actually Tell You Anything About Your Sunscreen?
If you've spent any time on TikTok lately, you've probably seen the UV camera videos: someone applies sunscreen, holds up a black-light-style camera, and shows the product glowing or turning dark on their skin. It looks dramatic and convincing. But does it actually tell you anything about how well your sunscreen works?
Short answer: not really. Here's the science behind why.
What is a UV camera, actually?
The devices behind these videos are usually modified cameras or phone attachments that mimic a Wood's lamp — a tool dermatologists have used for decades to diagnose things like fungal infections and pigmentation disorders. A clinical Wood's lamp emits a narrow band of UVA light, peaking around 365nm.
The consumer versions sold online for this TikTok trend are a different story. Most don't disclose their exact wavelength range or intensity, and there's no standardization or regulation across brands. So even if two videos look similar, the cameras behind them might not be doing the same thing.
Why does sunscreen show up dark under UV light?
When UVA light hits your skin, some of it gets absorbed and re-emitted as visible light — that's fluorescence, and it's part of why sunscreen (and pigmented skin) can look darker on camera. Skin without sunscreen tends to reflect and scatter the light instead, so it looks lighter by contrast.
That part's real physics. The problem is what people conclude from it.
Why "it doesn't look dark" doesn't mean "it doesn't work"
A lot of the trend's appeal comes from the idea that a sunscreen showing up dark under UV means it's "working," and one that doesn't is somehow weaker or fake. That's not how these filters behave.
Mineral filters like zinc oxide and titanium dioxide protect skin through a mix of scattering, reflecting, and absorbing UV light — not primarily through fluorescence. So a mineral sunscreen can look far less dramatic under a UV camera while still providing strong, broad-spectrum protection. Meanwhile, some chemical filters fluoresce more visibly, which can make for a more eye-catching video without necessarily meaning better protection.
In other words: the camera is picking up a specific optical property, not measuring efficacy.
What these cameras genuinely can't tell you
Based on the physics involved, UV cameras aren't built to:
Compare how different sunscreens perform against each other
Distinguish UVA protection from UVB protection
Tell you whether you've applied enough product
That last one matters a lot. Studies on sunscreen application have found that 1mg/cm² and 2mg/cm² of product — a twofold difference in protection — can look nearly identical under UV light. If you're using a camera to gauge whether you've applied "enough," it may not be giving you a real answer.
There's also a simpler consideration: these devices emit UVA light, and there's no strong reason to make a habit of shining that on your skin repeatedly just to check your sunscreen application.
“Pro tip: Use a UV camera only to see where you might have missed applying sunscreen—not to judge how effective it is.”
So are UV cameras completely useless?
Not entirely — they have one legitimate use. If you're trying to see whether you've missed a spot (ears, hairline, back of the neck are common misses), a UV camera can help you visualize coverage. That's a reasonable, low-stakes use case.
What it can't do is function as a strength meter or a way to rank one sunscreen against another. For that, you're better off looking at what's actually been tested: SPF ratings from proper lab testing, broad-spectrum labelling, and how consistently and generously you apply the product — which, evidence suggests, is where most people fall short regardless of which sunscreen they're using.
We make mineral sunscreens with 25% zinc oxide, tested for broad-spectrum UVA/UVB protection. If you're curious how they perform, sign up for our e-newsletter in our footer for the ultimate in sunscreen education.
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