The science · 6 min read
Red Light vs Blue Light Therapy: Which One Do You Need?
Two wavelengths, two completely different jobs.
January 14, 2025 · The Radia Atelier
Red and blue light are often sold together, but they treat fundamentally different concerns. Knowing which one solves your problem prevents you from paying for a mode you will never use.
Red and near-infrared: anti-aging and healing
Targets fibroblast activity, collagen synthesis, and inflammation. Used for fine lines, texture, rosacea, and post-procedure recovery.
Blue light: active acne
Blue light at 415 nm kills Cutibacterium acnes, the bacteria implicated in inflammatory acne. It is useful during breakouts and not particularly useful otherwise.
Should you buy a mask with both?
Only if you actually get inflammatory acne. If your primary concerns are fine lines, dullness, or texture, a red and near-infrared mask is the more efficient buy.
From the atelier
Shop Radia Lumen — The 7-Color Ritual
Red, near-infrared and blue in a single mask. Built for skin that moves between breakouts and fine lines.
Discover the ritual →Frequently asked
- Can blue light cause hyperpigmentation?
- High-intensity visible light, including blue light, can worsen melasma in susceptible skin. If you have melasma, choose red and near-infrared only.
Continue reading
How To
Red Light Therapy for Acne: Does It Actually Work?
Red light reduces acne inflammation. Blue light kills acne bacteria. Here is how to use both — or just one.
The Science
What Red Light Therapy Actually Does to Your Skin
A clear, evidence-based breakdown of what red light at 633 nm does inside skin cells — and what it cannot do.