Figure 4.

Putative synergy of H₂O₂ induction by complete solar light (UV + Vis + IR) compared to its individual components observed in human primary fibroblasts but not primary keratinocytes. Cells were irradiated with 2.16 SED solar‐simulated light and hydrogen peroxide generated was detected by the ROS‐Glo assay. The UV + VIS condition contains only UV above 380 nm (see methods). Error bars represent means SEM (N = 3). Statistical significance was assessed by performing a two‐way ANOVA with Bonferroni correction with multiple groups. *P < .05, ****P < .0001