Light
Daylight, artificial lighting, circadian rhythm, and lighting design for healthier, higher-performing homes.
Explore Light
One system, sunrise to lights-out
Each topic anchors into the flagship guide. Dedicated deep-dives come later — the guide covers the full system today.
Natural Light First
Orientation, windows, skylights, shading — the architectural decisions no fixture competes with.
The Artificial Layers
Ambient, task, accent, indirect — plus color temperature, dimming, CRI, and flicker.
Light Across the Day
Bright days, dim warm evenings, dark nights — the schedule the whole system should agree on.
Common Mistakes
Cans-only grids, cold LEDs, no dimmers, glare, bad kitchen and mirror light.
Designing Better Light
The priority order: bulbs and schedule, dimming, layers, windows, scenes, construction planning.
Directory
Systems & components
The circadian fixtures and control systems cataloged so far — entries are added when they earn a place, not to fill a grid.
Ketra S38
Ketra
Natural light emulation with tunable LED technology that follows the sun
Ketra Linear
Ketra
Linear fixture with full spectrum tunable white and vibrant color capabilities
RadioRA 3
Lutron
Whole-home lighting control system with elegant keypads and app control
Caseta
Lutron
Smart dimmer system with reliable Clear Connect technology
Savant Lighting
Savant
Luxury home automation with integrated lighting scenes and climate control
Operate it
Light protocols
Practices in the directory that run on the home's light system.
Morning Light Exposure
Bright light early in the day, used to anchor circadian timing — the foundation the rest of the sleep stack sits on.
Wind-Down
A fixed pre-sleep sequence that removes light, heat, and stimulation in order, so the end of the day looks the same to your body every night.
Evening Light Reduction
Dimming the house on a schedule so the last hours of the day stop reading as noon — the other half of morning light.
Red Light Therapy
Structured red and near-infrared light exposure — wavelength, distance, duration, and frequency, without the marketing.
In the wild
Documented builds
Homes in the directory with their lighting systems documented room by room.
Kayla Barnes-Lenz's Austin Longevity House
A full home 25 minutes outside Austin, designed around measurement and subtraction. Kayla Barnes-Lenz's residence documented room by room — lighting, air, water, sauna, bedroom, and the products that make it work.
Ben Greenfield's Idaho House
A 10,000-square-foot biohacking house on family land. Copper under the floors, ethernet in every room, a $150K red-light chamber downstairs — designed as generational infrastructure, not a wellness flex.
Reading