I’m sure it’s cumulative but the index changes throughout the day. Plus, I
Have read but don’t know if it works, that food high in lycopene, acts as a natural sunscreen. Foods like watermelon & tomatoes among others are high in lycopene. It’s suppose to help you get over a sunburn, too. [Post edited by Hoakie82 at 07/29/2019 3:41PM]