How much light should a room have?
There is no single figure that fits every room. A kitchen, where you chop vegetables, needs more light than a living room, where you relax — and both need more light sources than just one ceiling light if the lighting is to work in the evening.
Short answer: how much light a room should have depends on what you use the room for. Working rooms like the kitchen and office need even, strong light. Living spaces like the lounge and bedroom need less light, more layered, and something you can turn up and down yourself. As a very rough rule of thumb, living spaces need considerably less brightness than a kitchen or bathroom — but the most important principle isn't one correct number, it's that a room rarely works well with only one light source, however strong it is.
How much light should a room have, room by room?
- Kitchen. The room that needs the most light, because it's where sharp knives and hot surfaces are in use. Good general ceiling light, supplemented with light under the wall cabinets that shines straight down on the worktop without casting your own shadow.
- Bathroom. Strong, even light around the mirror so it doesn't cast shadows on the face — light from above alone typically leaves shadows under the eyes and chin.
- Office and reading spot. Focused task light on the work surface itself, ideally supplemented with weaker general light in the rest of the room, so the eyes don't have to jump between a very bright surface and a dark room.
- Living room and lounge. The room where layered, dimmable light matters most — here the light needs to shift from "we're watching a film" to "we have guests" to "we're reading a book", and one ceiling light rarely manages that on its own.
- Bedroom. The least light-hungry room day to day, but with a need for focused reading light by the bed and the option to dim right down in the evening.
What is warm and cool lighting?
Light sources are measured in colour temperature, given in kelvin. The lower the number, the warmer — more yellowish, reddish — the light appears. The higher the number, the cooler — more bluish, white. Warm light (around 2700-3000 kelvin) resembles the light from an old-fashioned incandescent bulb and feels cosy and relaxing. Cooler light (4000 kelvin and up) resembles daylight and feels sharper and more alert — well suited to work, less suited to relaxing in.
Most homes work best with warm light in living spaces and bedrooms, and slightly cooler light in the kitchen and bathroom, where you need to see details clearly. Mix colour temperatures in the same room — a warm floor lamp and a cool ceiling spot, for example — and a visible, unsettled contrast often appears, which most people find uncomfortable without being able to say why.
The three layers of light a room needs
- Ambient lighting. The general light that makes the room possible to move around and see in — typically a ceiling light or light reflected up from floor lamps.
- Task lighting. Focused light on what you're actually doing — a table lamp by the reading chair, light under the kitchen cabinets, a desk lamp.
- Accent lighting. Weaker, often warmer light that isn't meant for seeing sharply, but for making the room pleasant to be in — candles, a dimmed floor lamp, indirect light up a wall.
A room with only the first layer quickly feels flat and impersonal, however powerful the ceiling light is. Most rooms that "feel right" have all three layers — and can be turned up and down independently of one another.
What does the living room look like in the evening?
During the day, daylight from the windows dominates, and artificial light is often only a supplement. In the evening it's the other way round — all lighting comes from your own sources, and this is where the difference between one ceiling light and layered light really shows. A room with only one strong ceiling light becomes hard and flat in the evening: everything is lit equally, and there's nowhere for the eye to rest. A room with several weaker light sources at different heights — a floor lamp, a table lamp, indirect light — instead creates pools of light and shadow that make the room calmer to be in, even if the total amount of light is the same or less.
A dimmer on the main light fitting is one of the cheapest changes that makes the biggest difference to how a room feels in the evening — because it lets you lower the strong ambient light without switching it off entirely.
How many light sources should a room have?
A common rule of thumb among lighting designers is at least three light sources per living space, placed at different heights: one from above (ceiling), one at mid-height (table lamp, wall lamp) and one low down (floor lamp or indirect light). It isn't a hard requirement, but a reminder that variation in height and direction does more for a room's mood than simply turning up the strength of a single source.
Can you see a lighting plan before buying the lamps?
Partly. A 3D model or a walkthrough of a digital version of the room can show you where a lamp is placed and give a rough impression of how the light spreads and what mood a warm versus a cool source creates. That's useful for planning placement — is the lamp too close to a door, is it positioned where you actually read your book — and for comparing warm and cool light in the same room before you buy bulbs or fittings.
What a digital lighting plan cannot do
It cannot reproduce the physics of light precisely. Real light is reflected, scattered and glared off surfaces in ways a digital rendering can only approximate — a glossy floor tile reflects light differently from a rug, and a person's eyes perceive glare from a low lamp quite differently from how a screen does. It also cannot tell you the brightness in concrete lux figures for your home, only give a visual impression. For the final decision on how many watts or lumens a bulb should have, the manufacturer's own recommendations and a physical test in the room are still the most reliable route.
What HouseSense does
In HouseSense, lamps in the 3D walkthrough can cast real light with a strength and a warmth you set yourself and which is saved for the room. Each lamp can be switched off on its own, or you can switch everything off at once and see what the evening light in the room actually gives, with only the sources that are on. That makes it possible to compare how a room feels with different combinations of light switched on — but as with all digital lighting views, it's an approximation, not a substitute for standing in the actual room once the lamps are in place.