What does SPF mean?
SPF — Sun Protection Factor — measures the relative ability of a sunscreen to protect against UVB radiation (the wavelength primarily responsible for sunburn and a significant contributor to skin cancer). An SPF 50 product filters approximately 98% of UVB rays; SPF 30 filters approximately 97%. The difference seems small but it is meaningful with daily use over years.
Critically, SPF only measures UVB protection. UVA rays (longer wavelength, responsible for premature ageing, DNA damage, and a significant driver of pigmentation) penetrate much deeper into the skin and are not captured by the SPF rating. Look for 'broad-spectrum' on the label — this indicates UVA protection is also included. Heliocare 360° products are broad-spectrum with exceptionally high UVA coverage.
UVA vs UVB — why both matter
UVB radiation (wavelengths 280–320nm) is the burn ray — responsible for sunburn, direct DNA damage in the epidermis, and a major cause of skin cancer. It is most intense between 10am and 3pm and is partly filtered by glass. SPF ratings measure UVB protection.
UVA radiation (320–400nm) penetrates the dermis — much deeper than UVB — and is the primary driver of photoageing: collagen breakdown, elastin degradation, and the formation of deep wrinkles. UVA passes through cloud and glass and is present at fairly constant intensity throughout the day, year-round. For medium to dark skin tones (Fitzpatrick III–VI), visible light (380–700nm) also independently triggers melanin production — this is why Heliocare 360° Pigment Solution, which filters visible light via Fernblock® plus iron oxides, is essential for these skin tones.
Choosing the right SPF for your skin in South Africa
Durban sits at 30°S latitude with intense year-round UV. SPF 50+ is the minimum recommendation — not just in summer. For oily and acne-prone skin: Heliocare 360° Gel Oil-Free SPF 50+ is lightweight, non-comedogenic, and won't exacerbate breakouts. For dry or normal skin: Heliocare 360° Fluid SPF 50+ provides hydration alongside protection. For Fitzpatrick Type III–VI skin with pigmentation: Heliocare 360° Pigment Solution is non-negotiable — it filters visible light that standard SPFs miss.
Application is as important as SPF value. Most people apply 25–50% of the required amount. A quarter teaspoon (1.25ml) is the recommended amount for the face and neck. Reapply every 2 hours during outdoor exposure. Oral Heliocare capsules provide systemic photo-protection and amplify topical SPF — strongly recommended for patients who spend significant time outdoors.