Substance of Light's TRUE FILTER mist has accumulated thousands of views on social media since its appearance on Qui Veut Être Mon Associé in 2025. The concept is appealing: spray sunscreen over already-applied makeup, without having to rub it in. But between the promise and the reality, 139 Trustpilot reviews reveal a much more nuanced picture. Here's what we observe concretely, unfiltered.
Substance of Light offers an SPF25 PA+++ protective mist supposedly applied during the day over any step of your routine, including over makeup. The Trustpilot rating is 4.2/5 based on 139 reviews, which is decent but far from the 4.9/5 of the best specialized Korean skincare brands. The feedback is divisive: some buyers order 3 at once, others report irritation and uneven spray.
What is Substance of Light and who is behind the brand? 🌿
Substance of Light is a French brand founded by Clara Nentille, whose project originated from a personal problem: protecting her father's skin from UV rays without disrupting his daily routine. The brand was developed in collaboration with the French Society of Photodermatology, which gives it a real clinical basis for its anti-UV, anti-pollution, and anti-blue light positioning.
The flagship product, the TRUE FILTER SPF25 PA+++ mist, is formulated without controversial chemical filters. Its main value proposition can be summed up in one sentence: reapply sun protection over makeup in two seconds, without contact, without smudging. This is an almost non-existent niche in the French market, which explains the concept's virality on TikTok and during the M6 show.
The brand also positions its product as anti-blue light and urban anti-pollution protection, an argument that extends its use to the office and indoors. These claims should be qualified: SPF25 filters about 96% of UVA and UVB rays, which is effective for daily urban use, but insufficient if you spend several hours in direct summer sun or at the beach.
What Trustpilot reviews really reveal about the TRUE FILTER mist 🔍
The 139 reviews available on Trustpilot reveal clear trends. Positive feedback is consistent: practical spray format, no greasy film, compatibility with makeup confirmed by many users, and appreciated subtle fragrance. Several makeup artists mention using it professionally on their clients.
Negative feedback, however, converges on two recurring problems.
The first is mechanical: the sprayer produces uneven droplets rather than a fine mist. Buyers describe having to wipe drops off their eyes or mouth after application. The brand acknowledges the problem in its responses and advises spraying 15-20 cm from the face, which attenuates the effect but does not completely solve it.
The second is skin-related: some users report irritation, redness, tightness, or a feeling of dryness after a few weeks of regular use. Combination to dry skin types seem more susceptible to this effect. One user reported an eczema episode triggered after continuous use, with no response from customer service to her request for coverage.
| What users appreciate | What causes problems |
|---|---|
| Application over makeup without damaging it | Uneven spray, sometimes large droplets |
| Compact format, slips into a bag | Frequent reports of eye stinging |
| Non-greasy texture, invisible finish | Tightness and dryness on dry skin |
| Light and fresh scent | SPF25 insufficient for summer exposure |
| Protects against UV, pollution, and blue light | High price for a bottle that runs out quickly |
Composition and ingredients: what's really in it? 🧪
Substance of Light highlights a "clean" formula, without controversial ingredients according to Yuka. The TRUE FILTER mist contains combined mineral and chemical UV filters (full INCI list available on their website), without oxybenzone or octinoxate. The positioning leans towards responsible cosmetics, with French manufacturing.
What is notable: the brand displays its certifications and its collaboration with French photodermatology. This distinguishes it from generic sun sprays. However, the formula does not contain powerful moisturizing agents (hyaluronic acid, ceramides), which may explain the dryness feedback on already fragile skin.
The SPF25 PA+++ is a debatable choice for a primary sun protection. Dermatologists recommend SPF50+ for direct exposure. The PA+++ indicates good UVA protection (three out of four crosses), which is consistent for urban daytime use, but limits its use to this specific context. Users regularly request an SPF50, but a version is not yet available.
Expert advice: use this mist as a reapplication protection during the day, not as primary morning protection. If you're going into the sun, first apply an SPF50+ cream to bare skin, then use the mist for touch-ups. This is how the product truly delivers on its promise without leaving you under-protected.
Who the TRUE FILTER mist is really for, and who it isn't for 🎯
Based on the cross-analysis of reviews, the satisfied user profile is quite specific: normal to oily skin, daily makeup wearer, looking for a practical sun reapplication solution in an urban environment without touching their foundation. In this scenario, the mist delivers on its promise.
However, some profiles are clearly less well served.
- Dry or sensitive skin: real risk of tightness and irritation, confirmed by numerous converging reviews
- Contact lens wearers: eye stinging is a reported problem even with careful application
- Use in prolonged sun exposure: SPF25 is not suitable, SPF50+ is preferred
- Tight budget: the quantity/price ratio is criticized, the bottle runs out quickly with daily use
For oily or combination skin looking for a matte finish and light daytime office protection, this is an interesting option. For dry or reactive skin, lightweight Korean sunscreens with moisturizing active ingredients generally offer a much higher tolerance profile, with SPF50+ PA++++ that leave no white cast.
TRUE FILTER mist vs. Korean sunscreens: what the comparison reveals 🇰🇷
K-Beauty has popularized remarkably lightweight sunscreens for several years. Formulas like Beauty of Joseon Relief Sun SPF50+ PA++++ are now used daily by millions of people in Asia and Europe. These products have changed the relationship between combination and oily skin and sun protection.
The comparison with the TRUE FILTER mist is not a direct duel; the two products address different moments in the routine. But on certain criteria, the contrast is clear.
| Criterion | TRUE FILTER (Substance of Light) | Korean SPF50+ sunscreens |
|---|---|---|
| Protection factor | SPF25 PA+++ | SPF50+ PA++++ |
| Application over makeup | Yes (strong point) | No (requires starting over) |
| Tolerance for dry skin | Variable, mixed reviews | Good to very good depending on formula |
| Presence of moisturizing active ingredients | No | Yes (niacinamide, centella, hyaluronic acid) |
| Reapplication format | Practical (spray) | Inconvenient (cream to spread) |
| Indicative price | High for the quantity | €12 to €20 for 50 ml |
The real question to ask is about usage. If you wear makeup every day and want intermediate protection during the day without touching up, the mist has real merit. If you're looking for your primary morning sun protection, a Korean SPF50+ on bare skin remains the most protective and comfortable standard for most skin types.
You can find the Korean SPF50+ sunscreens selected by Holy Skin in the Korean sunscreen collection, with complete descriptions for each skin type. And if you don't yet know which routine suits your skin, the free skin diagnostic is made for that.
Where to buy Substance of Light mist and at what price? 📍
Substance of Light distributes mainly through its direct website substanceoflight.com. The brand is also listed in some pharmacies and parapharmacies, but availability remains limited and uneven across regions. Buyers are looking for physical points of sale near them (the search "substance of light point de vente" is rapidly increasing on Google), which the official website does not clearly facilitate.
On Amazon.fr, third-party sellers offer the product but without guarantee on preservation or after-sales service. The brand responds to 60% of its negative reviews on Trustpilot, with a response time often exceeding one month according to Trustpilot's own data, which is a point of concern if you encounter a product issue.
The price is regularly cited as a drawback. For a small bottle that can run out in a few weeks depending on the frequency of use, several users note that the quantity/price ratio is difficult to justify in the long term.
Verdict: what to take away from reviews of Substance of Light? ✅
Substance of Light has created an innovative product in an area that no one was really covering in France: sun reapplication over applied makeup. This is a real need, and the TRUE FILTER mist partially addresses it well. The clinical basis, formulation without controversial ingredients, and positioning as a serious French brand are real strengths.
But reviews converge on two hard-to-ignore limitations: an imperfect mechanical sprayer and inconsistent skin tolerance, especially on dry and sensitive skin. The SPF25 positions this product as a complementary protection, not a primary one, and this point deserves to be transparent before purchase.
Three things to remember before ordering:
- If your skin is dry or reactive, test in a small format or look for an alternative richer in moisturizing active ingredients
- Use the mist as a reapplication during the day, after an SPF50+ protection applied in the morning to bare skin
- Compare the price to the useful volume, especially if you plan to use it several times a day
If you want to explore Korean sunscreens that combine SPF50+ PA++++, moisturizing active ingredients, and lightweight textures for oily, combination, or sensitive skin, the Holy Skin selection offers the highest-rated formulas with recommendations by skin type. And if you don't yet know which routine suits your skin, the free skin diagnostic is made for that.
