SPF labels can feel reassuring until you do everything “right” and still end up red, tan, or blotchy. We sit down with board-certified dermatologist Dr. George Martin to unpack a missing piece in everyday sun protection: visible light and high-energy visible (HEV) light. If you’ve ever wondered what broad spectrum sunscreen truly covers, why UVA and UVB are treated differently, or why pigmentation seems to “break through” even your best routine, this conversation connects the dots with clear, practical skin science.
We start by mapping the UV spectrum in plain language: UVB as the classic burning ray tied to skin cancer risk, and UVA as the deeper penetrator linked to photoaging, collagen damage, and wrinkles. Then we move into what most people are not warned about: visible light can drive oxidative stress and free radical damage, and it can strongly worsen hyperpigmentation and melasma. Dr. Martin explains why many sunscreens effectively “stop” around 400 nanometers, leaving a gap where HEV light can still trigger redness and discoloration over long days outside.
We also tackle the blue light anxiety around phones and laptops, putting the intensity in context against outdoor sunlight. From there, we dig into what may actually help, including the role of iron oxides in tinted formulas, why concentration matters, and why the industry still lacks standardized testing for visible light protection claims. Finally, we bust a huge myth about shade and indirect UV exposure, plus the simple rules that protect kids and adults better in real-world conditions.
If sunburn, dark spots, or premature aging are on your mind, hit play, share this with a friend who never believes sunscreen “fails,” and subscribe for more practical dermatology. After you listen, what’s one sun protection habit you’re ready to change?
DISCLAIMER: The views and opinions expressed in the Derm-it Trotter! podcast are those of the host and guests and do not necessarily reflect the views or positions of the guests’ or host’s institution or employers. The Derm-it Trotter! Podcast is for general informational purposes only and does not constitute the practice of medicine, nursing or other professional health care services, including the giving of medical advice, and no doctor/patient relationship is formed. The use of information on this podcast or materials linked from this podcast is at the user’s own risk. The content of this podcast is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Users should not disregard or delay in obtaining medical advice for any medical condition they may have and should seek the assistance of their health care professionals for any such conditions.
