If you’re fitting new recessed spotlights in the ceiling, the hardest part is getting the right number and the right placement. Our free spotlight guide does the work in about two minutes: choose a HiluX spotlight, draw your rooms, and get the number, centre-to-centre (c/c) spacing, lux and a material list with measurements – ready for the electrician.
How to plan the right spotlighting
Good spotlighting isn’t about filling the ceiling with as many recessed spotlights as possible. It’s about giving each room the amount of light it needs, spread evenly and with the right light quality. The calculation above does the heavy lifting for you, but it helps to understand the thinking behind it, so you can tailor the result to your particular room and habits.
How to work out the number of spotlights
The most reliable method starts from light rather than from a fixed number of spotlights per square metre. First you decide how many lux the room should have. Lux is a measure of how much light lands on a surface. A living room is comfortable at 100–150 lux, while a kitchen, where you work with knives and pans, typically needs to be around 300 lux. Dining rooms and hallways sit somewhere in between.
Once you know the lux requirement, you multiply it by the room’s area in square metres. That gives the total number of lumens the room needs. A 12 m² kitchen at 300 lux therefore needs about 3,600 lumens. Divide that figure by the lumens per spotlight and you get the number of fittings. If a spotlight delivers 400 lumens, you end up with nine spotlights. Remember that a high ceiling, dark walls and deep furniture soak up light, so it’s better to choose slightly more than you need and control the level with a dimmer.
The spacing rule: how to position them
Even light with no dark gaps or harsh stripes depends on the spacing between the spotlights. A simple rule of thumb is to set the spacing equal to the ceiling height divided by two. With a ceiling of 2.4 metres, that gives about 1.2 metres between the spotlights. To the wall you keep only half that spacing, so around 60 cm in the example. This pulls the light down the wall and stops the edges of the room falling into shadow. Position spotlights so that they highlight what you want to see: the kitchen worktop, the seating area or a bookcase, rather than random points in the middle of the room.
Colour temperature and colour rendering
Colour temperature is measured in kelvin and determines whether the light feels warm or cool. 2700K gives a warm, yellowish light reminiscent of the old incandescent bulb and suits the living room and bedroom well. 3000K is slightly more neutral and white and works nicely in the kitchen and bathroom, where you want to see clearly. Choose one temperature per room, so the light looks consistent.
Just as important is the colour rendering, given as Ra or CRI on a scale up to 100. It tells you how true to life the colours are rendered. Cheap spotlights often sit at Ra80, where reds and skin tones look matt and lifeless. HiluX spotlights such as the D8 and D3 render at Ra97, which is close to daylight. Food looks more appetising, wood takes on its true tone, and clothes and make-up appear as they do outdoors. If you have the choice, high Ra is what lifts the experience most.
Bathroom, insulation and outdoors
In the bathroom the spotlights must withstand moisture. The requirement is governed by zones, which describe the distance to the shower and bath. Directly in the shower the strictest requirements apply, while the rest of the room is more lenient. A spotlight with IP44 withstands splashing water from all directions and covers most positions outside the water jet itself. If in doubt, choose the higher protection.
If the spotlights are going in a ceiling with insulation on top, they must not build up heat. Choose fittings that are expressly approved to be built directly into insulation, so you compromise neither fire safety nor the integrity of the insulation. Under eaves and in carports the spotlights must also be designed for outdoor use, with a sufficient IP rating against water and dust.
Dimming makes the difference
A room you can dim is far more usable than a room with only on or off. The best HiluX spotlights can be dimmed all the way down to 5 per cent without flickering or shifting colour, so you can go from full task lighting to a dimmed atmosphere on the same installation. Remember to choose a dimmer that matches the driver, and factor dimming in from the start – a forgotten dimmer is one of the most common regrets after a finished installation.
HiluX models for different needs
The range covers most situations. The D8 and D3 are the powerful workhorses with Ra97 for the kitchen, bathroom and living room. The D7 Gen2 is a versatile choice for the home in general. The DS8 Powered by Shelly has built-in smart control, so you can switch on, dim and automate without a separate system. The D10 uses the familiar GU10 fitting and is easy to swap. If the ceiling is low, or there are only a few centimetres above the board, the D1 Gen3 with just 10 mm recess depth is the solution that still leaves room in the structure.
The classic mistakes – and how to avoid them
Most disappointments come down to the same four things. Too few spotlights give a dark, uneven room, while far too many make the ceiling busy and the light flat. Spotlights placed too close to the wall cast harsh, unsightly shadows. The wrong kelvin mixes warm and cool light in the same room, so it looks messy. And a forgotten dimmer locks you to a single light level around the clock. Use the calculation and the rules above and you’ll avoid every one of them.
Frequently asked questions about spotlights
How many spotlights do I need in the kitchen?
Multiply the area by roughly 300 lux to find the total lumen requirement, and divide by the lumens per spotlight. A 12 m² kitchen needs around 3,600 lumens, which typically corresponds to eight or nine good spotlights. Position some of them directly over the kitchen worktop, where you work.
What’s the difference between 2700K and 3000K?
2700K is warm and yellowish like an incandescent bulb and suits the living room and bedroom. 3000K is slightly more neutral and cleanly white and works well in the kitchen and bathroom. The difference is small but noticeable – choose the same temperature throughout the room, so the light looks consistent.
Why does Ra97 matter so much?
Ra, also called CRI, measures how true to life colours are rendered on a scale up to 100. At Ra97 the light is close to daylight, so food, wood, skin tones and textiles get their true colour. Cheap spotlights with Ra80 make those same colours matt and lifeless.
Can I fit spotlights directly in the insulation?
Only if the fitting is expressly approved for it. Spotlights not designed to be covered by insulation can build up heat and pose a risk. Choose a model with the right approval, so you preserve both fire safety and the integrity of the insulation.
Which IP rating should I use in the bathroom?
It depends on the zone. Closest to the shower and bath the strictest requirements apply, while the rest of the room is more lenient. IP44 withstands splashing water from all directions and covers most positions outside the water jet itself. If in doubt, choose a higher protection.
How far down can HiluX spotlights be dimmed?
The best models can be dimmed all the way down to 5 per cent without flickering or shifting colour. That gives you full task lighting and a dimmed evening atmosphere on the same installation. Remember to choose a dimmer that matches the driver, and plan the dimming from the beginning.