You can buy a beautiful fixture, install it correctly, and still end up with a room that feels like a waiting area. Almost always the fixture is not the problem. The lamp inside it is.
Colour temperature, in plain terms
Colour temperature is measured in kelvin and describes the colour of the light itself, not its brightness. Counter-intuitively, lower numbers are warmer and higher numbers are cooler.
- 2200K is candlelight. Deeply amber. Beautiful in very small doses, murky as a room light.
- 2700K is the warm domestic standard, and it is what we specify throughout the catalogue. It is roughly the colour of a traditional incandescent bulb at full power.
- 3000K is a step cooler and slightly crisper. Common in kitchens and bathrooms, and a reasonable choice where you need to see clearly.
- 4000K is neutral white. It belongs in a garage or an office, and it will make a living room feel like a corridor.
- 5000K and above is daylight white. In a home it reads as cold and slightly clinical, whatever the fixture around it costs.
Why 2700K, and why we do not mix
At 2700K, warm materials look like themselves. Brass reads gold rather than green. Alabaster goes honey. Oak and walnut keep their colour. Skin looks well. The same fixtures under 4000K look grey and slightly dead, and the stone loses most of what you paid for.
The bigger error is mixing. A room with 2700K in the lamps and 4000K in the ceiling spots does not average out to something pleasant. The eye compares, so the cooler source reads as blue and faintly wrong. Pick one temperature for a room and hold it everywhere in that room, including the fixtures you inherited and the bulb you replaced in a hurry last year.
The number nobody checks
Colour rendering index, written CRI or Ra, measures how faithfully a light source shows colour compared with natural daylight, on a scale to 100.
Cheap LEDs sit around 80. That sounds high and is not. At CRI 80 the reds are the first casualty: terracotta goes brown, red veined marble goes muddy, wood loses its warmth, and food on a table looks unappetising. Look for CRI 90 or above. On a fixture whose entire purpose is to light natural stone, this is not a detail.
The difference between an 80 CRI bulb and a 95 CRI bulb, in the same fixture, in the same room, is larger than the difference between most fixtures.
Brightness is lumens, not watts
Watts measure consumption. Lumens measure light. An old 60 watt incandescent produced roughly 800 lumens, and that is the number worth remembering, because a modern LED reaching the same 800 lumens draws about 8 watts.
As a rough guide for a warm domestic room, aim for around 1500 to 3000 lumens in total for a living room, spread across several sources rather than concentrated in one. A single bright ceiling fixture doing all the work is the single most common reason a well furnished room feels unwelcoming.
Dimming, and the trap in it
A dimmable circuit is worth more than almost any other upgrade, because a room needs different light at four in the afternoon and eleven at night.
Two cautions. First, an LED must be marked dimmable or it will flicker, buzz or fail early. Second, standard LEDs dim down in brightness but hold their colour, so at ten percent they are a dim version of the same light. Incandescent bulbs got warmer as they dimmed, which is the effect most people are unconsciously after. If you want it, look for lamps described as warm dim or dim to warm, which drop from about 2700K toward 2200K as they go down.
If you are specifying a whole room and want the lamp choice to match the fixtures, ask us. It costs nothing and it is the cheapest way to make an expensive fixture look expensive.