Sunscreen or LED mask: which has stronger evidence behind it? Daily sunscreen: 903 people, 4.5 years.

Daily sunscreen. A single study settles this, because it's a size and length I haven't found for any at-home light device. Hughes and colleagues published the results of a randomised trial in the Annals of Internal Medicine in 2013, in which 903 adults under 55 from Nambour, Australia took part. Participants were randomly assigned: one group applied broad-spectrum sunscreen every day (this type protects against both UVA and UVB radiation), the other group only when they felt they needed to. Skin ageing was measured on the skin's surface microtopography (the pattern of tiny furrows in the skin, scored by evaluators who didn't know which group each person was in), between 1992 and 1996, meaning over 4.5 years. 1

The result: in the group using daily sunscreen, there was no detectable increase in skin ageing after 4.5 years. The daily group's skin ageing was 24 percent lower from the start of the study to the end than the occasional group's (relative odds 0.76, 95 percent confidence interval between 0.59 and 0.98). The confidence interval is the range within which the true effect most likely lies; here its upper edge sits close to one, meaning the "no difference" boundary, so the effect is real but not huge. The authors themselves describe the limitation too: some outcome data was missing, and the study's power to detect moderate effects was modest. 1

In the same trial, the beta-carotene tablet (the carrot's pigment, given as an antioxidant) showed no effect on skin ageing (although the authors note that they also saw associations in opposite directions among subgroups that were aged to different degrees at baseline), so the "protect your skin from the inside" supplement idea wasn't borne out here. 1 What you can take from this: the largest and longest randomised trial I found for slowing skin ageing is about a tube of sunscreen, and if you want to spend money on any one skincare step, this is the one with the strongest data behind it among the studies cited here.

Photoageing (skin ageing caused by the sun's ultraviolet radiation) is a gradual process that depends on the duration and strength of sun exposure. This definition comes from a 2021 review that gathered cell-culture (laboratory, cell-based) studies; the authors name changes in cell metabolism and oxidative stress (an excess of reactive oxygen molecules generated in the cell that damage proteins and DNA) as the main pathways. 2 Two ultraviolet bands from sunlight reach the skin: UVB has the shorter wavelength and is mainly responsible for sunburn, UVA has the longer wavelength and, according to the source, is the cause of premature skin ageing. 9 A sunscreen protects against both only if it's broad-spectrum. According to the European Commission's 2006 recommendation, the measured UVA protection should reach a third of the SPF value on the label, and the critical wavelength should be 370 nanometres. 9 The circled UVA mark is the industry's (Cosmetics Europe) seal that carries this threshold forward.

I'm not writing the exact proportion of wrinkles that can be attributed to the sun here, because I couldn't trace the commonly cited "80–90 percent" figure back to a primary measurement, and the review above is about laboratory studies on cells, not a proportion measured in people. What is available, measured in people, is the Hughes trial: for those who applied sunscreen daily, skin ageing didn't increase over 4.5 years. 1 What you can take from this: UV radiation is one documented driver of skin ageing, and the defence against it is broad-spectrum sunscreen applied daily.

The at-home, portable phototherapy studies I found are mostly about acne-prone skin, and none reaches the size of the sunscreen study. Papageorgiou and colleagues in 2000 split 107 people into four groups: blue light, mixed blue and red light, white light, and five percent benzoyl peroxide cream. The three light arms used a portable light source, 15 minutes daily; the study ran for 12 weeks, and the mixed arm's improvement in inflammatory acne lesions averaged 76 percent (95 percent confidence interval between 66 and 87). The blue-only arm's own percentage isn't in the abstract, so I'm not citing it. 3 Na and Suh in 2007 treated one half of 28 volunteers' faces with a portable red-light device, twice daily for 15 minutes, over 8 weeks; on the treated side, both the inflammatory and non-inflammatory lesion counts improved significantly compared to the other side. This is a small, single-blind study. 4 Friedmann and colleagues in 2026 compared an at-home device combining 660 nanometre red and 415 nanometre blue light with a blue-only device: out of a target of 30, 23 people completed the 8-week, once-daily study; the count of inflammatory lesions decreased in both arms, but the decrease in total lesion count was only significant in the red-blue arm, not at any time point in the blue-only arm, and there was no significant difference between the two arms in lesion counts; on the investigator global assessment score at week 8, the combined red-and-blue arm was significantly better. This was an open-label study, with no sham-device arm. 5

Nothing follows from these studies for the wrinkle question, because that isn't what they measured. There are studies that measure wrinkle outcomes too, with other devices; on this page I'm not offering the mask for that purpose, and I'm not citing these studies as a benefit of the mask. I'm describing two of them because they show how much the results of two similar studies can differ. Park and colleagues in 2025 studied 60 people of Asian descent, aged 30 to 65, with Fitzpatrick skin types II–V, using an at-home mask combining 630 nanometre red and 850 nanometre infrared light, for crow's feet wrinkles, at two centres, double-blind, sham-device controlled, over 16 weeks; independent, blinded evaluators found a significant difference compared to the control at weeks 8, 12 and 16. The study was funded by the mask's manufacturer, Y&J Bio; according to the authors, the study design, data collection, analysis and writing were carried out independently of the funder, and they report no conflict of interest. 6 Bragato and colleagues in the same year studied 95 women aged 45 to 60 with a different, 660 nanometre red LED mask, three or two times a week, over 4 weeks, with a sham-treated control group; on the blinded wrinkle scale (scored by three experts from photos, without knowing who received light) they found no significant difference between the groups; on wrinkle length measured with image-analysis software, in two facial areas the light-treated groups were better than the control; the FACE-Q satisfaction score was 79.6 and 73.4 percent in the light-treated groups, significantly higher than in the sham-treated group. 7 The two studies worked with different masks, different blinded scales and different results: in Park's, the independent experts also found a difference, in Bragato's, only the software measurement and self-report did, the expert scale didn't. Both studies had a sham-treated control group, and according to the authors, participants didn't know which group they'd been assigned to. When a mask's page cites a wrinkle study, ask who funded it, and whether the difference showed up on the blinded expert scale or only in self-reports.

So by study size and length, the picture looks like this: for sunscreen, 903 people and 4.5 years; for the three at-home, portable-light acne studies, between 23 and 107 people and 8 to 12 weeks; for the two wrinkle studies, between 60 and 95 people and 4 to 16 weeks, with different outcomes. Look for this when a mask's page mentions a study: how many people, how many weeks, who funded it, who scored the result, and whether they knew who received the light.

The strength of the evidence sets the order, and your wallet says the same thing. The first step is a cleanser that doesn't dry out your skin, the second is a moisturiser, the third is daily, broad-spectrum sunscreen in the morning. These three make up the basic routine, and of the three, sunscreen is the one backed by the 903-person, 4.5-year study. 1 If your skin can tolerate it, your dermatologist can also decide on an evening retinoid (a vitamin A derivative; whether it's right for you, at what strength and in what form, is for your dermatologist to decide, not me); I'm not citing a study for this in this article, so I'm not ranking it in the evidence order. Alongside a retinoid, I apply sunscreen even more carefully in the morning; this is my own cautionary practice, not data measured for this specific combination.

A light device comes at the end of this order, as the last layer, once your basic routine has been running for six months and you have money set aside for it. This is the order because the LED mask replaces nothing from the first three steps: it doesn't cleanse, it doesn't moisturise, and it doesn't protect against UV. Whoever starts with a mask is starting with the most expensive step, and the one backed by the weakest evidence for slowing skin ageing among the studies cited here. So the order is: cleanser, moisturiser, daily sunscreen, and only then a light device; I'm not citing a study for a retinoid in this article, your dermatologist knows what's right for you.

In my shop, the 50 millilitre tube of sunscreen serum is 4 990 Ft, the LED mask is 129 900 Ft. So one tube of sunscreen is roughly a twenty-sixth of the mask's price. How many tubes you go through in a year depends on how much you apply: the SPF value is measured in the lab with 2 milligrams of sunscreen per square centimetre, and if you apply that much to your face, your tube runs out faster. 10 If you went through one a month, that's 59 880 Ft a year too, meaning less than half the mask's price. In this field, flexible silicone masks also run from roughly 88 thousand up to over 200 thousand Ft, so the difference isn't specific to my own pricing.

With the mask, there's no consumable after the purchase price, but there is a battery, which loses capacity over time, and there's a use pattern of 3–5 sessions a week, up to 10 minutes each, that has to be kept up for it to have any chance of adding anything at all. What you can take from this: sunscreen is a few tubes a year, the mask is a lot once, and of the two, sunscreen is the one the evidence is about.

I'm studying to be a cosmetologist; I started taking skincare seriously because of my own wrinkles and acne scars. I tried eight LED masks, and after the eight, I got a clear picture of what makes a good LED mask; only then did I dare start selling one of my own. My mask has a rigid frame, 99 LEDs, no LEDs along the eye line, and the box guide specifies 3–5 sessions a week, up to 10 minutes each. I sell it as an at-home cosmetic light device, not for wrinkles, because I haven't found a wrinkle study for my own mask, and I don't cite other people's studies as a benefit of the mask.

The shop also has a sunscreen serum (SKIN1004 Hyalu-Cica Water-Fit Sun Serum SPF50+ PA++++, 50 millilitres, 4 990 Ft). I'm writing this here because this article is about exactly that: if you have to choose between the two, get the sunscreen, from me or from anyone else. The mask is the last step, not the first.