Circadian Lighting
A Home Assistant custom component that syncs color-changing lights with the natural daylight cycle to support circadian rhythms.
What is Circadian Lighting?
Circadian Lighting is a custom component for the Home Assistant open-source home automation platform. It automatically synchronizes the color temperature and brightness of compatible smart lights with the natural daylight cycle throughout the day. It solves the problem of static, artificial indoor lighting by creating a dynamic environment that supports the human body's circadian rhythm for better sleep and health.
Home Assistant users and smart home enthusiasts who want to automate their lighting in a health-conscious way, particularly those interested in wellness, sleep optimization, and creating a more natural living environment.
Developers choose this component because it provides a deeply integrated, automated, and highly configurable solution for circadian lighting within the Home Assistant ecosystem, eliminating the need for manual adjustments or separate, proprietary lighting systems to achieve this biological synchronization.
Overview
Circadian Lighting custom component for Home Assistant
Use Cases
Best For
- Automating smart lights to follow the natural color temperature of the sky
- Creating a home lighting schedule that supports sleep hygiene and circadian health
- Building wellness-focused home automation routines in Home Assistant
- Providing nighttime lighting that is visible but won't disrupt sleep preparation
- Graphing and analyzing daylight-synchronized lighting data over time
- Integrating circadian lighting principles with other Home Assistant automations
Not Ideal For
- Smart home setups not using Home Assistant, as this is a custom component exclusive to that platform.
- Users with smart lights that only support basic on/off or dimming without color temperature control.
- Projects requiring simple, set-and-forget lighting schedules without the complexity of daylight simulation.
Pros & Cons
Pros
Automatically adjusts light color temperature from cooler midday hues to warmer dawn/dusk tints, mimicking the natural sky progression for a biologically harmonious environment.
Sets lights to a dim, cool white at 1% brightness for nighttime, providing visibility without disrupting circadian rhythm or melatonin production, as highlighted in the README.
Accommodates various smart lights by supporting control via mireds, RGB, XY color space, or brightness-only modes, ensuring compatibility with different hardware.
Offers extensive configuration options for location, color temperature range, brightness curves, and transition intervals, allowing precise tuning to user preferences.
Cons
Exclusively designed for Home Assistant, making it unsuitable for other smart home platforms and creating dependency on a single ecosystem.
Requires manual YAML configuration and understanding of advanced settings, which can be daunting for users not versed in Home Assistant's intricacies.
Only works with lights that support color temperature or RGB/XY control, excluding many basic smart bulbs and fixtures, as implied by the optional switch configurations.
Frequently Asked Questions
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