The No.1 Urban Aesthetics Supplement Edit | In‑depth editorial | ~20 min read LED light therapy is not new. It’s not trendy. And it’s not a gimmick. What is  new is how we now understand why it works , how it fits into skin regeneration and collagen banking , and why professional protocols like Dermalogica LuminFusion  have elevated LED from a passive add‑on to an intelligent, biological intervention. This is a deep dive — into the science, the skin biology, the limitations,