When we market SPF 50 sunscreens, marketers often talk about protection against UVA and UVB rays. When sunlight reaches your skin, the light holds different wavelengths, these wavelengths are classified as UVA, UVB and visible light. Visible light holds a wavelength longer than that of both UVA and UVB sunrays.
According to a study from the National Library of Medicine , visible light is not mere harmless light and holds the potential for contribution to pigmentation, particularly in people prone to hyperpigmentation and in darker skin phototypes.
In this article, we go a step further into the topic of SPF and visible light and SPF ratings which the label does not tell you.
WHAT DOES SPF 50 ACTUALLY MEASURE?
In order to understand the fuss around visible light we need to go back a little around the topic of sunscreen and sun protection. It all starts with this one abbreviated term SPF which we see in all sunscreen products. To dive deeper into it, SPF is nothing but a shorter form of sun protection factor, whose job is to tell you how well your sunscreen is protecting you against the sun under standardized testing conditions. UV radiation transmitted by the sunrays is what leads to sunburn/redness/erythema while also slowly damaging the collagen present into the skin.
In the guide How UV rays break down collagen , we go further into how UV rays actually affect your skin which leads to multiple concerns around sun damage.
Think of SPF as a protection multiplier
As a simplified mathematical interpretation:
- SPF 30 → about 96.7% of erythema-producing UV is filtered
- SPF 50 → about 98%
- SPF 100 → about 99%
SPF measures protection against UVB-induced erythema, plain and simple, the redness and burning response your skin has to UVB rays specifically. That's the entire job of the number.
WHAT IS VISIBLE LIGHT?
UV rays are generally classified as UVA (320–400 nm wavelength) and UVB (280–320 nm wavelength), visible light holds a higher wavelength of 400–700 nm. Visible light is the part of sunlight that your eyes can actually see, it includes the wavelengths which are responsible for color and brightness which the naked eye observes. Despite visible light having a much lesser biological damaging properties, studies have found that visible light can produce long-lasting pigmentation, and that the effect can be stronger and longer-lasting in darker skin than some UVA exposures. (PubMed)
DOES SPF 50 BLOCK VISIBLE LIGHT?
Not based on the SPF number, no. SPF doesn't quantify visible-light protection in any capacity, it was never designed to. A product can carry SPF 50 on its label and still have zero specific testing behind visible-light protection, these are two separate properties of a formula, not two names for the same thing. Treating UV protection and visible-light protection as interchangeable is where a lot of confusion creeps in. The ingredients doing the UV-blocking work aren't automatically doing anything for visible light, a formula needs something extra, specific, to cover that ground.
DOES PA++++ PROTECT AGAINST VISIBLE LIGHT?
PA is a measure to test the protection a sunscreen provides against UVA induced sunlight. The additional plus (+) symbol in the label discusses the different PPD range, this topic is discussed in much more detail in our guide What Is PPD in Sunscreen? How Is It Different From PA++++ . However, you don't automatically get visible-light protection out PA++++ ratings simply, visible light has a longer wavelength which isn’t what PA ratings are for.
WHY DOES VISIBLE LIGHT MATTER FOR SKIN?
The relevance here narrows down to one specific issue: pigmentation. Visible light can contribute to hyperpigmentation and this effect shows up more prominently in skin of colour, where melanin-producing cells appear to respond more actively to visible-light exposure than they do in lighter skin. If you're prone to melasma, or dealing with any kind of persistent, stubborn pigmentation, this is a genuinely relevant piece of your photoprotection strategy to think through. (PubMed)
WHAT PROVIDES PROTECTION AGAINST VISIBLE LIGHT?
TINTED SUNSCREENS
Certain tinted formulas contain pigments that add a genuine layer of visible-light protection beyond what a standard clear UV filter provides on its own. The tint isn't just cosmetic here, it's functionally doing something.
IRON OXIDES
According to a study from National Library of Medicine wherein a randomized trial was conducted it was observed that SPF ≥50 UV-only sunscreen when compared besides SPF ≥50 sunscreen + iron oxide for visible light, in people with melasma. The iron-oxide-containing sunscreen produced greater improvement in several measures of melasma. So there is real clinical evidence behind the idea.
Iron oxide specifically has become the ingredient dermatology circles point to most often for this purpose, a pigment used in some tinted formulas with real research behind its role in visible-light protection.
Note: Formulation and the exact pigment composition used both matter, tint alone doesn't guarantee protection just because it adds color. Few current research does support iron-oxide-containing tinted sunscreens as effective against reducing visible-light-induced pigmentation.
DOES EVERYONE NEED VISIBLE-LIGHT PROTECTION?
No, not everyone requires visible light protection. Visible light does not automatically mean pigmentation and thus leaning towards a tinted sunscreen, the main reason dermatology recommends using a tinted or iron-oxide inclusive sunscreen is when you are struggling with melasma or existing hyperpigmentation, the reason being existing melanin triggers a series of cycle events around melanin and its effects on the long run. And we already know that melanin is triggered by UV radiation the most, but UV is not the same as visible light so the potential risk around it reduces substantially.
HOW IS VISIBLE-LIGHT PROTECTION DIFFERENT FROM SPF AND PA?
Here is a table which simplifies the confusion around all three types of discussed sunlight:
| Protection | Wavelength | Relevance in sunscreen |
|---|---|---|
| UVB rays | 280-340nm | Measured using SPF ratings |
| UVA rays | 340-400nm | Measured using PA ++++ ratings |
| Visible-light protection | 400-700nm | Usage of iron oxides in sunscreens |
RECOMMENDED SUNSCREEN
DECONSTRUCT GEL SUNSCREEN
- Formulated with SPF 50 PA++++ which provides broad spectrum protection against both UVA and UVB radiation.
- Protects the skin against photoageing, collagen damage, tanning, pigmentation and sunburns.
- Uses new-gen photostable UV filters MBBT, DHHB, BEMT and EHT and has better formulation which is more suitable for every skin type.
- Non-comedogenic and fragrance free formula making it suitable for everyday use for normal, oily and combination skin types.
- Lightweight feel and non-greasy texture that does not leave the skin feeling tacky or oily upon layering and suitable for oily skin types as well.
- Does not leave behind any whitecast and settles down into a smooth and comfortable sunscreen on the skin.
- Gentle and non-drying formula built around humectants using advanced science backed formulation.
- Recommended by dermatologists and provides maximum PA protection, it is the perfect everyday sunscreen on the go.
SHOULD YOU CHOOSE TINTED OR CLEAR SUNSCREEN?
Clear sunscreen tends to make sense for everyday UV protection, a lightweight cosmetic finish and anyone who doesn't have a specific reason to prioritize visible-light pigmentation protection on top of standard coverage.
Tinted sunscreen earns real consideration if you're dealing with pigmentation-prone skin, melasma, or you specifically want visible-light protection built into your routine. This comes down to your own concern rather than one option being the universally superior choice, tinted sunscreen isn't an upgrade everyone needs, it's a more targeted tool for a specific situation that not everyone is dealing with.
WHAT SHOULD YOU LOOK FOR WHEN CHOOSING SUNSCREEN?
As a general rule while looking for a sunscreen few basic criterias are more than enough to choose a good sunscreen. If pigmentation and melasma are a genuine concern go for a tinted sunscreen which has iron oxides as one of its ingredients. Pick a sunscreen that provides broad spectrum protection against UVA and UVB sunlight with SPF 50 PA ++++ rating. Choose one which is fragrance-free, cruelty and paraben free and is non-comedogenic built around new-generation UV filters.
FREQUENTLY ASKED QUESTIONS
DOES SPF 50 PROTECT AGAINST VISIBLE LIGHT?
No, not specifically. SPF 50 measures protection against UVB-induced sunburn and doesn't quantify or guarantee any level of protection against visible light on its own.
DOES PA++++ PROTECT AGAINST VISIBLE LIGHT?
No. PA++++ reflects UVA protection strength, a separate measurement from visible light entirely and it doesn't represent any visible-light protection rating.
CAN VISIBLE LIGHT CAUSE PIGMENTATION?
Yes, visible light can contribute to hyperpigmentation and this effect has been shown to be particularly relevant in skin of colour, where it can worsen or trigger existing pigmentation concerns.
IS VISIBLE LIGHT WORSE FOR DARKER SKIN TONES?
Current evidence suggests visible light may have a more pronounced pigmentation effect in skin of colour compared to lighter skin tones, making it a more relevant consideration for those individuals.
DO TINTED SUNSCREENS PROTECT AGAINST VISIBLE LIGHT?
Some do, particularly those containing iron oxides, but not all tinted sunscreens protect equally, formulation and pigment composition genuinely determine the actual level of protection.
DOES IRON OXIDE PROTECT AGAINST VISIBLE LIGHT?
Yes, studies have shown that iron oxide can provide meaningful protection against UV radiation ranging between 400-500nm wavelength, in relation to pigmentation (PubMed).
DO I NEED VISIBLE-LIGHT PROTECTION IF I DON'T HAVE PIGMENTATION?
No, ideally in case you do not have melasma, pigmentation or hyperpigmentation using a separate sunscreen which specifically claims to protect against visible sunlight is not required.
IS SPF 50 ENOUGH FOR EVERYDAY SUN PROTECTION?
Yes, most sunscreens in the current market provide SPF 50 protection as it provides 98% protection against UVB induced sunlight. Additionally, look for a sunscreen that has a higher PA(+) range for UVA induced sunlight protection.
CONCLUSION
To summarize everything we discussed so far, we can conclude that visible light protection is not something that needs to be your immediate concern, unless you are someone dealing with melasma, pigmentation and hyperpigmentation. Visible light holds a longer wavelength when compared to UVA induced sunlight, with some evidence suggesting that it can trigger pigmentation. But worth noting on a more biological level the damage caused by visible light is much less. So, what helps is choosing a tinted sunscreen with iron oxide in case of pigmentation or using a normal sunscreen in case of normal skin.
We recommend using The Deconstruct Gel Sunscreen , which is fragrance-free, non-comedogenic and backed by scientific research, recommended by dermatologists and a cult-favourite for a reason.