Illuminations
of Camberley · Est. 1971
Understanding Light
The five factors that determine whether a room feels exactly right - or almost right. Interactive demonstrations from Surrey's specialist lighting showroom.
The five factors that determine whether a room feels exactly right - or almost right. Interactive demonstrations from Surrey's specialist lighting showroom.
Measured in Kelvin, colour temperature is the single number that most defines how a room feels. Drag the slider to see the difference between candlelight warmth and cool daylight.
The most widely recommended range for domestic living spaces. Warm white light is relaxing, flattering to skin tone, and creates an inviting atmosphere in rooms designed for comfort. This is the colour temperature of traditional incandescent bulbs - familiar, comfortable, and rarely wrong in a living room or bedroom.
As colour temperature rises, light becomes progressively crisper, cleaner, and eventually harsh. Neutral white (around 4000K) works well in kitchens and bathrooms. Above 5000K, light becomes noticeably clinical - useful in home offices or utility rooms, but unwelcoming in spaces designed for relaxation.
For living rooms and bedrooms: 2700K to 3000K. For kitchens and bathrooms: 3000K to 4000K depending on how much warmth you want. For home offices and utility spaces: 4000K. Avoid anything above 4500K in rooms where you spend time relaxing - the light becomes clinical and unflattering, working against the atmosphere you are trying to create.
In our showroom: We can demonstrate any fitting at its rated colour temperature in real conditions. This matters because every product photograph is taken in controlled studio light - you cannot judge colour temperature from an image. Come and see the actual light before you decide.
The same fitting, the same bulb - transformed entirely by a dimmer switch. Light level is the most powerful tool for controlling atmosphere in any room.
A fitting specified without dimming capability is a fitting that can only ever do one job. With a dimmer, the same ceiling pendant serves morning brightness, afternoon comfort, and intimate evening atmosphere. Dimming also significantly extends LED bulb life by reducing thermal stress.
Lumens measure the total light output of a bulb or fitting - not quality, just quantity. A rough guide: aim for 150-200 lumens per square metre for general living room ambient light. But a single 2000-lumen ceiling fitting will feel harsher than four 500-lumen sources spread around a room, even though the total output is identical. Distribution matters as much as quantity.
You do not need one, but fitting one transforms what a room can do. Without dimming, a light can only operate at full output. If you want dimming, you must specify dimmable LED bulbs at purchase - they are not interchangeable with non-dimmable versions. You should also use a trailing-edge dimmer switch, which is designed for LED technology and avoids the flickering and buzzing that older leading-edge dimmers can cause with modern bulbs.
In our showroom: We can advise on dimmer compatibility for every fitting we stock, and demonstrate the difference between a well-specified dimmable installation and a flicker-prone one. Getting this right at specification stage costs nothing. Getting it wrong after installation is expensive to correct.
Spot, flood, or wide flood - the beam angle determines what you illuminate and how dramatically. This is one of the most commonly overlooked specifications in domestic lighting.
A tight, intense beam that creates dramatic pools of light. Ideal for artwork, sculpture, display cabinets, and architectural features where you want to draw the eye to a specific point. The narrow cone produces very high intensity on a small area - effective for theatre but too harsh for general illumination.
The most versatile range for domestic use. Provides focused, purposeful light without creating harsh contrast. Works well for kitchen worktops, dining tables, and anywhere you want directional light without drama.
A softer, wider wash of light. Good for general room illumination from recessed downlights, and for bathrooms where even, shadow-free light is the priority.
Approaches omnidirectional light output. Used in corridors and large open areas where broad, consistent coverage matters more than direction or drama. Also effective for wall-washing, where the goal is to illuminate an entire wall surface evenly.
For general domestic downlighting, 36 to 45 degrees is the most versatile starting point. For accent lighting on artwork or features, use 15 to 25 degrees. For broad bathroom or corridor illumination, 60 degrees or more. The beam angle is not just about coverage - it determines the intensity of the light at the object, the sharpness of shadows, and the overall atmosphere. A room lit entirely with wide-flood downlights will feel flat; mixing beam angles creates depth.
In our showroom: We can demonstrate beam angles on real fittings at realistic mounting heights. The difference between a 25-degree and a 45-degree downlight is immediately obvious in person - it is very difficult to convey in a specification sheet.
Good lighting is never a single source. Toggle each layer on and off to understand why every well-designed room needs at least three types working in harmony.
The foundational layer - general illumination that lets you move safely around a room. A ceiling pendant, central downlights, or a flush fitting. Ambient light on its own produces flat, shadowless illumination that feels institutional. It is necessary, but it is only the starting point.
Directed light for specific activities: reading, cooking, applying makeup, working at a desk. A floor lamp beside a sofa, under-cabinet strips in a kitchen, a well-positioned downlight above a worktop. Task lighting must be positioned to avoid casting shadows on the work area.
Directional light used to highlight artwork, architectural features, bookshelves, or display areas. Accent lighting creates the pools of light and shade that give a room its visual depth and interest. A room without accent lighting tends to look and feel flat, regardless of how carefully everything else is specified.
Light fittings that are themselves visually interesting - a sculptural floor lamp, a statement pendant, a backlit shelf. Decorative light is part of the design of the room, not just a tool for illumination. A well-chosen decorative fitting is something you notice even when it is switched off.
Layered lighting means combining multiple types of light source - ambient, task, accent, and decorative - rather than relying on a single overhead fitting. Most rooms lit with only a central ceiling light feel flat because all shadow is eliminated. Shadow is what gives a room its sense of depth and dimension. Layering restores shadow selectively and deliberately, creating rooms that feel considered rather than simply illuminated.
In our showroom: Our consultation service develops a room-by-room lighting scheme that specifies each layer, including product codes, quantities, positions, and dimmer compatibility - a document your electrician can work directly from.
CRI measures how accurately a light source reveals the true colours of what it illuminates. Drag the slider to see how poor rendering strips colour from a room.
You chose your paint colours, textiles and furnishings in daylight. High-CRI lighting means they look the same under artificial light in the evening. Low-CRI lighting shifts and desaturates everything - a rich teal reads as grey-green, a warm terracotta looks muddy, skin tones lose their warmth. The room looks less like the room you designed.
Many budget LED bulbs and fittings claim Ra80 on the packaging but measure significantly lower in independent testing. CRI is not regulated in the way wattage or lumen output is. This is one of the reasons we only stock fittings from suppliers whose quality we can vouch for - and why seeing a fitting in our working showroom matters. The CRI difference between a good fitting and a cheap one is immediately visible on a human face.
CRI - Colour Rendering Index - measures how accurately a light source reveals the true colours of objects, on a scale from 0 to 100 where 100 equals natural daylight. For domestic use, Ra80 is the generally accepted minimum. Ra90 or above is recommended for any room where colour matters - living rooms, dining rooms, bedrooms. Ra95 or above is worthwhile anywhere you have artwork or carefully chosen paint colours. The difference is visible to the naked eye and consistently underestimated by people who have not seen it demonstrated side by side.
In our showroom: We can demonstrate colour rendering directly - the same object under different CRI sources, side by side. It is the most persuasive demonstration we offer, and the one that most surprises people who assumed all white light was essentially the same.
Answers to the questions we are most frequently asked - in the showroom, by phone, and by people planning a new build or renovation in Surrey and beyond.
A rough guide is 150 to 200 lumens per square metre for ambient light in a living room. However, a single high-lumen fitting will feel harsher than multiple lower-output sources even at the same total lumen count. Distribution matters as much as quantity. If you are using dimmers, specify bulbs with higher lumen output than you think you need - a bulb dimmed to 60 percent gives you headroom to increase if required.
A kitchen typically needs at least three layers: ambient downlights for general illumination (3000K to 4000K is appropriate here), task lighting directly over worktops and the hob (under-cabinet LED strips work well), and ideally some warmer decorative lighting over a dining area if the kitchen includes one. The common mistake is relying entirely on a grid of downlights, which provides adequate lumen output but no flexibility and a very flat, uniform result.
Yes, within reason. A common and effective approach is to use 2700K for ambient and decorative sources, and a slightly cooler temperature (3000K) for task lighting where clarity matters. What tends to look wrong is mixing warm and cool light on the same surface - for example, a 2700K pendant next to a 4000K downlight hitting the same wall. The eye reads the difference immediately and it feels incoherent. The general rule is to keep all sources visible from the same viewpoint within half a Kelvin stop of each other.
UK building regulations define three zones in a bathroom. Zone 0 is inside the bath or shower itself - fittings here must be rated IP67 minimum and operate at 12V. Zone 1 is directly above the bath or shower to a height of 2.25 metres - fittings must be IP45 minimum. Zone 2 extends 60cm outside the perimeter of the bath or shower and 2.25 metres high - fittings must be IP44 minimum. Outside these zones there are no specific IP requirements, though IP44 as a minimum is generally recommended in any bathroom environment due to steam and humidity.
Hallways are often under-lit or lit badly because they are treated as purely functional spaces. A well-lit hallway creates the first impression of a home. Consider: a statement pendant or semi-flush fitting for ambient light; wall lights to add warmth and reduce the corridor effect; and a downlight or two positioned to highlight any artwork, mirrors, or architectural detail. Colour temperature should match the adjacent rooms - if your living room is 2700K, a 4000K hallway will feel cold and disconnected by comparison.
Illuminations of Camberley at 66-68 High Street, Camberley, Surrey GU15 3RS is an independent specialist lighting showroom that has been operating since 1971. The working showroom displays fittings illuminated so you can see how they actually perform - colour temperature, beam angle, and light quality - before committing to a purchase. Open Monday to Saturday, 9am to 5:30pm. Call 01276 24941 to discuss your project before visiting.