Does the SPF 15 in this cream replace a dedicated sunscreen?

The built-in SPF 15 is designed for everyday city exposure — commuting, sitting near windows, short walks between buildings. It filters a portion of UVB rays and helps limit the cumulative damage that leads to uneven tone and premature surface changes. However, SPF 15 blocks only about 93% of UVB radiation, whereas SPF 30 blocks roughly 97% and SPF 50 about 98%. For any situation where you'll be outdoors for more than 15–20 minutes — lunch on a terrace, a park walk, sports, beach — a dedicated broad-spectrum sunscreen (SPF 30 or higher) applied in the correct amount (2 mg/cm², roughly a quarter teaspoon for face and neck) is necessary. Reapply that sunscreen every two hours, or after sweating or wiping your face. You can layer the dedicated sunscreen over this cream once the cream has absorbed (about 2–3 minutes). If you wear makeup, many tinted moisturisers or foundations also contain SPF, but they rarely provide the labelled protection because people apply too little; treat them as a supplement, not a replacement.