Colour temperature: warm, neutral and cool light explained
Why a candle glows amber and a winter sky looks blue, what the Kelvin number on a lamp really means, and how to choose warm, neutral or cool light for each room.
12 articles
Light & Technology
Kelvin, CRI, lumens, LED, dimming and smart light.
Colour temperature, colour rendering, lumens, glare and dimming decide whether light feels beautiful. We explain the technology in plain words, so you can read a label and plan light like a professional.
Colour rendering: why CRI matters for beautiful light
Two lamps can share the same brightness and warmth, yet make a ripe tomato, a velvet sofa or your own face look completely different. The reason is colour rendering.
Lumen, lux and watt: how much light do you need
Watts once told us how bright a bulb would be. With LEDs, lumen and lux have taken over. What the three words mean, and how to work out the right amount of light for each room.
Dimming LED lights: what works and what flickers
An LED that hums, flickers or refuses to dim smoothly is rarely broken. It is usually a mismatch between lamp and dimmer. How dimming works, and how to get it right.
Layering light: ambient, task and accent
A single ceiling light makes a room visible. Several layers of light make it beautiful. How lighting designers build ambient, task, accent and decorative light, room by room.
LED explained: how modern light sources work
Within two decades the light-emitting diode has replaced the bulb that lit our homes for more than a century. What an LED is, how it makes white light and what separates good from mediocre.
Smart lighting: scenes, sensors and control
Smart lighting is less about gadgets than about calm: the right scene at one touch, light that finds its way at night, and switches that still work when the router does not.
Glare: why good light never hurts your eyes
Glare is the reason a beautiful lamp can still feel wrong. How direct and reflected glare arise, what shielding angles and UGR mean, and how shades, height and placement keep light comfortable.
IP ratings explained: lamps for bathrooms and outdoors
IP44, IP65, IP68: the two digits on a lamp tell you how well it keeps out dust and water. What each digit means, and which ratings suit bathrooms, terraces, ground lights and pools.
Circadian lighting: light that follows the day
Our bodies keep time with light. What research suggests about bright days and dim evenings, how tunable white systems work, and simple, sensible routines for lighting a home through the day.
Energy labels for light sources: reading the A to G scale
Since September 2021, bulbs and LED light sources in the EU carry a rescaled energy label from A to G. What the classes mean, why a good LED may sit in class E, and where the QR code leads.
Indirect lighting: let the walls and ceiling do the work
Indirect light bounces off walls and ceilings before it reaches you, which makes it soft, calm and almost shadowless. How coves, uplights and wall washers work, and how to avoid the classic mistakes.
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