What problem this solves
Most circadian lighting plans on the open web give one piece of advice: “warm light at night.” That’s true but insufficient. A good plan should specify intensity (lux at the eye) too, because bright 2400K light still suppresses melatonin. It should also target morning light exposure ≥ 30 min, since morning light is the strongest circadian zeitgeber. This tool schedules all of it.
Who it’s for
- Designers specifying tunable-white systems
- Homeowners designing a circadian-friendly bedroom or office
- Shift workers trying to manage alertness without ruining sleep
Limitations
- Targets are averages; age, eye health, and chronotype shift them
- Schedules assume artificial control; daylight access modifies lux targets
- Doesn’t account for screen time; LED screens at high blue can override the plan
- WELL-certified fixtures differ widely in melanopic output even at the same Kelvin