防曬 SPF/PA 解讀｜日常防曬產品推薦

SPF50 PA++++ 究竟係咩意思？

幾乎每支防曬都印住一堆數字同「+」號，但好多人其實唔清楚呢啲標示代表咩。SPF（Sun Protection Factor）係量度對 UVB 嘅防護能力，主要對抗曬傷；PA（Protection Grade of UVA）就係量度對 UVA 嘅防護，「+」越多代表防護程度越高，主要對抗導致老化、色斑嘅光害。搞清楚呢兩個標示，先可以揀到真正適合自己嘅防曬。

Almost every sunscreen bottle is covered in numbers and "+" symbols, yet many people aren't sure what they actually mean. SPF (Sun Protection Factor) measures protection against UVB rays, which primarily cause sunburn. PA (Protection Grade of UVA) measures protection against UVA rays — more "+" symbols mean stronger protection against the rays linked to premature aging and pigmentation. Understanding both is key to choosing the right sunscreen for your needs.

物理防曬 vs 化學防曬：點揀好？

物理防曬（又稱礦物防曬）主要靠氧化鋅、二氧化鈦喺皮膚表面反射紫外線，質地通常較厚身，但對敏感肌相對溫和。化學防曬就靠有機防曬劑吸收紫外線並轉化為熱能釋放，質地一般較清爽，但部分成分對某些膚質可能較刺激。敏感肌或者暗瘡肌，可以優先考慮質地清爽、配方單純嘅防曬產品。

Physical (mineral) sunscreens use zinc oxide or titanium dioxide to reflect UV rays off the skin's surface — typically thicker in texture but generally gentler for sensitive skin. Chemical sunscreens absorb UV rays and convert them into heat, usually with a lighter feel, though some ingredients may be more irritating for certain skin types. For sensitive or acne-prone skin, prioritizing a lightweight, simply-formulated sunscreen is often a safer bet.

日常防曬唔止防曬傷，仲有助延緩老化

紫外線係造成皮膚老化嘅主要外在因素之一，長期缺乏防曬保護，皮膚容易出現幼紋、色斑同彈性下降嘅情況。就算陰天或者留喺室內，紫外線都可以穿透雲層同玻璃，所以日常防曬唔應該只喺出街嘅日子先做，而係應該養成每日嘅習慣。

UV exposure is one of the leading external causes of skin aging. Without consistent sun protection, skin can develop fine lines, pigmentation, and reduced elasticity over time. Even on cloudy days or indoors, UV rays can penetrate clouds and glass — which is why daily sunscreen should be a habit, not just something reserved for sunny outdoor days.

香港天文台資料顯示，本港夏季日間紫外線指數（UV Index）經常超過10，達到「甚高」甚至「極高」級別；根據衞生防護中心資料，當指數達到11或以上，天文台會呼籲市民避免長時間曝曬。根據2017年香港癌症資料統計中心公佈嘅數字，皮膚癌喺本港常見癌症排名中位列第7，反映紫外線防護喺香港嘅氣候環境下絕非小事。

According to the Hong Kong Observatory, the daytime UV Index in Hong Kong frequently exceeds 10 during summer, reaching "Very High" or even "Extreme" levels; the Centre for Health Protection notes that when the index reaches 11 or above, the Observatory advises the public to avoid prolonged sun exposure. Per 2017 Hong Kong Cancer Registry figures, skin cancer ranked as the 7th most common cancer in Hong Kong — underscoring that UV protection is far from optional in this climate.

推介清爽唔笠嘅防曬選擇

BARR Centella Soothing Sun Essence (SPF 50+ PA++++) 質地屬精華狀，清爽好推開，唔會有厚重白痕，同時配方加入積雪草成分，喺防曬之餘幫助舒緩肌膚，適合敏感肌日常使用，亦適合喺妝前作為防曬底霜使用。

The BARR Centella Soothing Sun Essence (SPF 50+ PA++++) has an essence-like texture that spreads easily without leaving a heavy white cast. Formulated with Centella Asiatica, it helps soothe the skin while providing sun protection — suitable for sensitive skin's daily use, and can also double as a makeup base.

防曬常見迷思

迷思一：SPF 數值越高，代表可以隔耐先補搽一次。SPF 反映嘅係防護強度，唔係防護時間長短，就算用 SPF50，都會因為出汗、觸摸面部、化妝脫落等原因減效，一般仍然建議每2至3小時補搽一次。

Myth 1: A higher SPF number means you can go longer between applications. SPF measures the strength of protection, not how long it lasts. Even SPF 50 loses effectiveness from sweat, touching your face, or makeup wearing off — reapplication every 2–3 hours is still generally recommended.

迷思二：底霜或者隔離霜有標示 SPF，就可以取代獨立防曬產品。呢類產品嘅防曬係數同用量往往未必達到標籤上嘅防護效果（一般人化妝時用量遠低於測試用量），建議仍然喺妝前搽足量獨立防曬產品。

Myth 2: A makeup primer or BB cream with an SPF label can replace standalone sunscreen. These products are rarely applied in the thick, even layer used during SPF testing, so real-world protection often falls short of the labeled number. A separate, generously-applied sunscreen underneath is still recommended.

迷思三：舊年剩低嘅防曬今年仍然一樣有效。防曬劑開封後會隨時間同接觸空氣、陽光逐漸失效，一般建議留意包裝上嘅開封後使用期限（PAO），過咗有效期或者質地、氣味有變，就應該更換新產品。

Myth 3: Leftover sunscreen from last year still works just as well. Sunscreen actives degrade over time once opened, especially with exposure to air and light. Check the Period-After-Opening (PAO) symbol on the packaging, and replace it if it's expired or the texture/smell has changed.

常見問題 FAQ

  • Q: 室內都要搽防曬嗎？
    A: 建議搽。紫外線（尤其係 UVA）可以穿透玻璃，長期室內工作對住電腦、窗邊，都建議做好日常防曬。
    Q: Do I need sunscreen indoors? A: Yes, it's recommended. UV rays, especially UVA, can penetrate glass — so working near windows or screens for long hours still warrants daily protection.
  • Q: 防曬要幾耐補搽一次？
    A: 一般建議每2至3小時補搽一次，特別係戶外活動、流汗或者游水之後，更加要及時補搽。
    Q: How often should sunscreen be reapplied? A: Generally every 2–3 hours, and more frequently after outdoor activities, sweating, or swimming.
  • Q: 敏感肌用防曬容易搽完刺痛，點算好？
    A: 可以優先揀質地清爽、成分單純嘅防曬產品，避免香精同酒精，並喺使用前做小範圍測試。
    Q: My sensitive skin often stings after applying sunscreen — what should I do? A: Look for a lightweight, simply-formulated sunscreen without added fragrance or alcohol, and always patch test before full application.

由今日起，將防曬變成日常習慣

防曬唔止係夏天先需要做嘅步驟，而係全年、每日都應該堅持嘅護膚基本功。揀一支清爽、溫和又高防護嘅防曬，例如 BARR Centella Soothing Sun Essence (SPF 50+ PA++++)，喺 by Glowsis 為你嘅肌膚打好抵禦紫外線嘅第一道防線。

Sunscreen isn't just a summer step — it's a year-round, everyday essential. Choose a lightweight, gentle, and high-protection option like the BARR Centella Soothing Sun Essence, available at by Glowsis, to build your skin's first line of defense against UV damage.

Sources

Back to blog