LED Light Therapy: What the Colours Actually Do

This guide explains what the different LED colours actually do, which ones are genuinely useful for concerns like acne, inflammation, ageing, and healing, and which claims are often exaggerated by beauty marketing. If you’ve ever wondered whether green light helps pigmentation, blue light kills acne bacteria, or red light really supports collagen production, this article breaks down the science in a practical, easy-to-understand way.

The truth is that LED therapy is not magic it’s a supportive treatment that works best when the correct wavelength is matched to the right skin condition and combined with consistency, professional guidance, and an overall healthy skin barrier. Understanding how each colour interacts with the skin can help you avoid unrealistic expectations and choose treatments that actually make sense for your skin goals. LED therapy has gone from clinic-only to "in every facial" in less than a decade. For one reason: the science finally caught up with the marketing. Here's what each wavelength actually does, and which one your skin needs.

Red Light (630-660 nm). Collagen and repair

This is the most-studied wavelength in dermatology. Red light penetrates the upper-mid dermis, stimulates fibroblasts (the cells that produce collagen) and accelerates wound healing.

What it treats:

• Fine lines and loss of firmness
• Slow-healing skin (post-treatment recovery)
• General dullness and ageing concerns

Blue Light (405-420 nm). Acne

Blue light kills *Cutibacterium acnes*, the bacteria responsible for inflammatory acne. It's antibacterial without the side effects of antibiotics or harsh topicals.

What it treats:

• Active inflammatory acne
• Persistent breakouts
• Bacterial congestion

Near-Infrared (810-940 nm). Deep regeneration

Near-infrared penetrates deepest. It triggers cellular repair at the mitochondrial level, reducing chronic inflammation.

What it treats:

• Rosacea and persistent redness
• Pigmentation
• Deep wrinkles
• Long-term skin health

The clinical evidence:

Multiple peer-reviewed studies show measurable improvement in fine lines, skin texture, and acne lesion count after 8-12 sessions of LED. It's not a miracle, but used consistently it compounds.

Why we use it in every treatment:

LED amplifies the results of everything else. After cleansing, exfoliation, hydration. 10 minutes of LED locks in the benefits and accelerates recovery. There's no downtime, no risk, and the cumulative effect is significant.

It's why The Reset Facial includes LED, and why we've added Clinical LED Phototherapy as a standalone add-on.