The Light Spectrum

← HIGHER ENERGY · · · DEEPER PENETRATION →

UV Blue Green Red Near-IR Far IR

ULTRAVIOLET (UV) (below 400nm) — The Activator

What it is: The high-energy, invisible end of the spectrum. You can't see it, but the body reads it through the eyes and skin.

What it does:

• Triggers vitamin D production — bone health, immunity, mood
• Builds melanin — the body's solar panel, the molecule that converts light into electrons
• Provides the activation energy for chemical reactions inside cells
• Supports immune function — antibacterial, antiviral, anti-inflammatory
• Drives neurotransmitter synthesis — the chemistry behind mood, focus, motivation

What blocks it: Window glass blocks UV completely. A sunny office is dark for your biology. Sunglasses block it from the eyes. Sunscreen blocks it from the skin.

The key insight: UV from the sun comes balanced with red and infrared — the wavelengths that protect and repair. Isolated UV (like a tanning bed) has none of that balance. The sun is safe because it delivers UV inside the full spectrum. Remove the balance and the risk changes.

BLUE AND VIOLET (400–500nm) — The Clock Signal

What it is: The short-wavelength, high-energy end of visible light. The most powerful timing signal the body receives.

What it does — from the sun:

• Sets the master clock in the brain — tells every cell what time it is
• Drives alertness and wakefulness during the day
• Supports cognitive function and focus

What it does — from LEDs and screens (isolated):

• Destroys DHA in cell membranes — the fat the brain depends on
• Raises blood glucose — even without food
• Causes insulin resistance
• Destroys melanopsin — the clock receptor in the eye
• Suppresses melatonin at night — the hormone that orchestrates all overnight repair
• Disrupts collagen repair and fascial remodelling

The critical difference: Blue light from the sun arrives balanced with every other wavelength — red, infrared, UV, green. The body can handle it because the protective wavelengths ride alongside it. Blue light from LEDs and screens arrives isolated — no red, no infrared, no balance. The body has no defence against isolated blue because it never existed in nature.

Why this matters: The same colour of light — blue — is beneficial from the sun and damaging from a screen. The difference isn't the colour. It's what's missing around it.

GREEN (500–600nm) — The Reflection

What it is: The middle of the visible spectrum. The colour you see when you look at grass, trees, and plants.

What it does:

• Plants absorb most visible light for photosynthesis but reflect green — that's why they look green
• The red light that plants DON'T use bounces off toward you
• Dense green spaces saturate your skin and eyes with reflected red wavelengths
• A walk through a forest or a tree-lined fairway is passive red-light therapy

The key insight: Green spaces aren't just visually peaceful. They're changing the spectrum around you — bouncing red wavelengths at every cell in your body. The greener the environment, the more you're bathed in red light without knowing it.

RED (600–700nm) — The Repair Signal

What it is: The long-wavelength end of visible light. The colour of sunset, fire, and the glow of embers.

What it does:

• Absorbed by mitochondria — supports energy production
• Absorbed by water inside cells — begins structuring the exclusion zone
• Absorbed by collagen and proteins — energises muscle, supports tissue repair
• Reduces inflammation
• Penetrates deeper into the body than shorter wavelengths

Where you get it:

• Sunrise and sunset — the richest natural windows
• Fire — broadband red and infrared
• Plants — reflected red from green spaces
• Red light panels — a narrow, isolated slice (limited, not a replacement for the sun)

NEAR-INFRARED (700–1,100nm) — The Deep Charger

What it is: Just beyond what the eye can see. The wavelength range that penetrates deepest into the body — through skin, through muscle, into organs, into cells.

What it does:

• Absorbed by water — structures the exclusion zone, charges the water battery
• Absorbed by mitochondria — increases efficiency of energy production, creates more water, more energy
• Absorbed by collagen and proteins — energises muscle fibres, speeds recovery
• Enhances cellular hydration — combats dehydration at the cellular level
• Triggers mitochondrial biogenesis — the creation of new, healthier engines
• Heats the water around mitochondria, pulling the respiratory proteins closer together — tighter proteins, better energy

Where you get it:

• The sun — about 42% of sunlight reaching the Earth's surface is near-infrared
• Your own body heat — you radiate infrared constantly
• Fire — broadband infrared, the natural nighttime source
• Hot water — baths, hot tubs radiate infrared into the skin
• Traditional sauna — intense broadband infrared from outside in
• Red light panels — a narrow slice of this range (the science on whether isolated frequencies are always beneficial is still evolving)

The key insight: Near-infrared is the largest portion of sunlight — and the one indoor life removes completely. Walls, windows, and LEDs deliver zero infrared. This is the biggest gap between indoor life and outdoor life.

FAR INFRARED (above 1,100nm) — The Heat

What it is: The wavelength range you feel as warmth radiating from a fire, a sauna, a hot bath, another person, or the sun on your skin.

What it does:

• Initiates molecular movement within cells
• Supports heat shock protein activation
• Promotes deuterium depletion through the skin (in traditional saunas)
• Drives the warmth response that the body associates with recovery and safety

Where you get it:

• Traditional wood-fired sauna — the gold standard for broadband far infrared
• Fire — sitting by a fire delivers far infrared to every inch of exposed skin
• Hot baths and hot tubs — warm water radiates infrared
• The sun — delivers the full range throughout the day

WHAT THE SUN DELIVERS vs WHAT MODERN LIFE DELIVERS

The sun: UV + blue + green + red + near-infrared + far infrared. Everything, balanced, together. About 100,000 lux on a clear day.

Indoor LEDs and screens: Isolated blue. No UV. No red. No infrared. About 300 lux. That's 0.3% of the intensity and a fraction of the spectrum.

A red light panel: A narrow slice of red and near-infrared. Useful as a supplement. Not a replacement.

A fire: Broadband red and infrared. The natural nighttime source. What humans sat around every evening for thousands of years.

A traditional sauna: Intense broadband infrared. The deepest heat-recovery tool still available.

A hot bath: Gentle infrared through warm water. Universal access. No equipment needed.

The hierarchy is always the same: the sun first. Everything else supports.

HOW TO USE THIS REFERENCE

Come back to this page whenever you're reading a protocol and want to understand what a wavelength does. The protocols tell you what to do. This page tells you what's happening when you do it.

The body doesn't need you to understand the spectrum. It already knows. But when you understand what the light is doing, the protocols stop being instructions and start being obvious.

The sun delivers everything. Indoor life delivers almost nothing. The protocols are how you close the gap.

Stay connected.