Is Your Home Making You Tired? The Truth About Healthy Lighting
How much thought do you give to the lighting in your home? In Episode 8 of The Healthy House Podcast, Aaron is joined by Sam Coles to explore how light influences our daily lives, from our mood and concentration to how we wind down in the evening.
With Sam Coles, Sam Coles Lighting Design Consultants
What this episode covers
Lighting is one of those things most homeowners only think about when it’s wrong — a kitchen that never feels quite bright enough over the worktop, a bedroom lamp that makes it hard to switch off at night, a living room that somehow looks harsh no matter what bulb goes in. In episode eight of The Healthy House Podcast, host Aaron Worrall talks to lighting designer Sam Coles of Sam Coles Lighting Design Consultants about how much lighting actually shapes daily life at home, from mood and concentration during the day to how easily the body winds down in the evening.
The conversation moves from the science of how light interacts with the body clock, through practical fitting choices for rooms like kitchens, to a specific look at lighting and sensory comfort for people with autism and ADHD — an angle that’s rarely covered in typical home-improvement advice.
Light, the body clock, and why it matters more than you’d think
A recurring theme is that lighting is not a purely decorative decision. Natural light and the colour temperature of artificial light both interact with the body’s circadian rhythm — the internal clock that governs sleep, alertness and mood. Bright, cooler light during the day helps signal to the body that it’s time to be awake and focused; warmer, dimmer light in the evening supports the wind-down before sleep. Get that sequence backwards — bright, cool light late at night, or dim, warm light all day in a home office — and it works against how the body naturally wants to regulate itself.
Warm versus cool lighting, room by room
The episode sets out a practical way to think about colour temperature: match it to what a room is for and when it’s used. Warmer lighting generally suits spaces built around relaxing — living rooms in the evening, bedrooms, anywhere the goal is to wind down. Cooler lighting suits spaces built around focus and task work, such as kitchens and home offices, where a brighter, more alert quality of light is useful. Treating every room the same, with one bulb type used throughout the house, misses the different jobs lighting actually needs to do.
Common kitchen lighting mistakes
Kitchens come in for particular attention, since they’re one of the rooms where lighting choices go wrong most often. A single bright ceiling light is a common default, but it rarely serves a kitchen well on its own — worktops end up in shadow, the space can feel flat, and there’s no way to dim things down for anything other than cooking. The conversation covers layering lighting instead: task lighting focused on worktops and hobs, ambient lighting for the room as a whole, and accent lighting where it’s useful, rather than relying on one fitting to do every job.
Flicker, glare and sensory comfort
One of the more distinctive parts of the conversation looks at lighting through the lens of sensory sensitivity — specifically for people with autism and ADHD. Flicker (often invisible to some people but noticeable and disruptive to others) and glare from exposed, bright bulbs can make a room genuinely uncomfortable to be in, not just aesthetically unpleasant. Baffled fittings, which recess or shield the bulb rather than leaving it in plain view, come up as a straightforward way to cut glare without losing usable light — a small specification choice that can make a real difference to how comfortable a space feels.
Lighting that adjusts through the day
The conversation closes on the idea of lighting that changes rather than staying fixed — brighter and cooler in the morning, warmer and dimmer as the evening goes on, echoing the natural pattern of daylight rather than running one setting around the clock. That doesn’t have to mean an expensive smart lighting system; it can be as simple as using different lamps and fittings at different times, or choosing bulbs with adjustable colour temperature in the rooms used most.
Who should listen
This episode is for anyone renovating, planning a new home, or simply looking to improve the lighting in their existing space, particularly if previous lighting choices have been made on looks alone. It’s also worth listening to for parents or carers of anyone with sensory sensitivities, since the discussion of flicker, glare and fitting choice applies directly to making a home more comfortable to live in.
Questions this episode answers
What's the difference between warm and cool lighting, and where should I use each?
Warm lighting sits at the lower end of the colour temperature scale and tends to suit evenings and spaces meant for relaxing, such as living rooms and bedrooms. Cooler lighting is better suited to areas where you need to concentrate, like kitchens and workspaces, because it reads as brighter and more alert.
What are the most common kitchen lighting mistakes?
Episode 8 points to relying on a single bright ceiling light rather than layering different types of lighting for different tasks, and choosing fittings on looks alone without thinking about glare or colour temperature. Getting kitchen lighting right usually means combining task lighting over work areas with softer ambient light for the rest of the room.
Does lighting really affect sleep and mood?
Yes — the episode explains that natural light and colour temperature interact with the body's circadian rhythm, which influences mood, concentration during the day and how easily you wind down at night. Getting more natural light during the day and shifting to warmer, dimmer light in the evening can support that rhythm rather than working against it.
Why does some lighting cause glare or flicker, and does it matter?
Glare and flicker come from how a bulb is specified and how a fitting exposes or shields it, not just from how bright a light is. Episode 8 highlights that this matters beyond simple comfort — for people with autism, ADHD or other sensory sensitivities, flicker and glare can make a room difficult to be in.
What is a baffled light fitting, and why would I want one?
A baffled fitting recesses or shields the bulb so it isn't directly exposed to view, which cuts glare without reducing the amount of light the room gets. Episode 8 discusses baffled fittings as a straightforward way to make a room's lighting more comfortable, particularly for anyone sensitive to bright, exposed light sources.
Should my home's lighting change throughout the day?
Episode 8 makes the case for it: lighting that shifts from brighter and cooler in the morning to warmer and dimmer in the evening can support the body's natural rhythm better than one fixed setting used all day. This can be as simple as using different lamps and fittings at different times, or as involved as a tuneable lighting system.