DIY circadian Home Assistant hack

A Home Assistant lighting hack that swaps harsh bedroom light for diffuse strips and turns the room red at 10 p.m. is getting wide attention in maker circles. (x.com) The post was amplified by Pieter Levels, who linked to the setup on X, where the post showed about 146,000 views and 425 likes. Levels has a large audience of software and hardware tinkerers, which helped push a niche home-automation demo into a broader consumer-tech feed. (x.com) (lexfridman.com) Circadian lighting means changing brightness and color across the day to mimic daylight outdoors and warmer light after sunset. Home Assistant users have been building that behavior for years with custom components that tie light settings to time of day and the sun’s position. (github.com 1) (github.com 2) One widely used Home Assistant add-on, Adaptive Lighting, says it adjusts brightness and color based on the sun while still allowing manual control. Its GitHub repository showed about 3,200 stars this week, a rough measure of sustained interest in the feature among Home Assistant users. (github.com) The sleep angle is straightforward: blue-heavy light tends to keep people more alert at night, while warmer and dimmer light is less likely to push the body away from sleep. Harvard Health says evening light exposure can suppress melatonin and that even dim light can affect circadian timing. (health.harvard.edu) Sleep Foundation says red light may support sleep with less circadian disruption than blue-enriched light, while also noting that the evidence is still developing. That leaves room for consumer products and do-it-yourself systems that shift bedrooms toward amber or red late in the evening without claiming a medical effect. (sleepfoundation.org) The technical trick in this case is not inventing a new bulb but changing how existing fixtures behave. Diffuse strips spread light across a surface instead of firing it straight from a bright point, and Home Assistant can schedule a color change at a fixed hour such as 10 p.m. through automations and custom lighting integrations. (github.com) (deepwiki.com) That kind of low-friction retrofit fits the Home Assistant ecosystem, where users often combine off-the-shelf bulbs, LED strips, and software rules instead of buying a single branded “sleep lighting” package. Community posts and blueprints show the same pattern: brightness, color temperature, and hue are all being tied to bedtime, presence, and sun position. (community.home-assistant.io 1) (community.home-assistant.io 2) The immediate takeaway for lighting brands is visible in the reaction count: people will watch a bedroom-lighting tweak if it looks simple and sleep-oriented. The more these hacks circulate, the more “tunable,” “adaptive,” and schedule-driven lighting moves from hobbyist feature to baseline expectation. (x.com)