Colour temperature: choosing between 2700K and 5000K
The number that decides whether a room feels comfortable or clinical.
What this covers
- What Kelvin measures
- 2700K
- 3000K
- 4000K
- 5000K and above
- The mistake people come back about
- Colour rendering is separate
- Tunable and multi-temperature fittings
- Judging on a screen is unreliable
What Kelvin measures
Colour temperature describes the tint of white light on a scale in Kelvin. Lower numbers are warmer and more yellow; higher numbers are cooler and more blue. It is counterintuitive that higher numbers look colder, and that is the usual source of confusion.
2700K
Warm white, close to traditional incandescent light. It flatters skin tones, makes timber and warm colours look rich, and reads as relaxing. It is the usual choice for living rooms, bedrooms and any space where the purpose is comfort rather than task.
3000K
Slightly less yellow, described as soft or warm white depending on manufacturer. It suits kitchens and bathrooms in homes where 2700K feels too dim in character, and it is a common compromise across an open-plan space.
4000K
Neutral white. Colours appear close to how they look in daylight without the blue cast of higher temperatures. It suits kitchens, workshops, garages and bathrooms where seeing accurately matters more than atmosphere.
5000K and above
Daylight. Bright, slightly blue and unambiguously functional. It is right for workshops, garages, security lighting and task areas, and it makes a living room feel like an office. High bay and outdoor fittings are commonly supplied at this temperature.
The mistake people come back about
Mixing temperatures within one room. Two bulbs a thousand Kelvin apart in the same space read as a fault, because the eye compares them directly and concludes one is broken. Decide the temperature for a room before buying any of its bulbs.
Colour rendering is separate
CRI describes how accurately a light source renders colours, on a scale to one hundred. A high Kelvin number does not mean high CRI. For anywhere colour matters – a wardrobe, a kitchen, a workspace – CRI is worth checking alongside temperature.
Tunable and multi-temperature fittings
Some fixtures offer several selectable temperatures via a switch, and some are adjustable from a remote. These are genuinely useful where a room serves more than one purpose, and they remove the need to commit in advance.
Judging on a screen is unreliable
Photographs of lit rooms are white-balanced, which removes the very difference you are trying to judge. This is the main reason a showroom is more useful than a catalogue for this specific decision.
How this applies when you are buying
Three numbers decide whether a bulb is right. The base code must match the socket. Lumens, not watts, tell you how bright it is. Kelvin tells you the colour: around 2700K is warm, 4000K neutral, 5000K and above is daylight. Mixing colour temperatures in one room is the thing people most often regret.
LED bulbs listed by base type, wattage equivalent, lumen output and colour temperature, in single and multi-packs.
On the shelf at the moment
These come straight from the A & E Bowery Lighting shelf as you read this, not from a list typed when the article was written, so the prices and the availability are current.
- WASTROYAL ST58 LED Light Bulbs, Shatterproof Edison Bulbs 60 Watt Equivalent – $7.99
- TJOY G9 LED Bulb 4W, 6000K Daylight 10 Pack, 40 Watt Eq, G9 Base, 120V – $18.99
- 10 Pack GU10 Led Bulb 6W Equivalent 50W, MR16 Led Bulb 5000K Daylight White Led Bulbs – $13.59
Where to go from here
All of the above is the reasoning we use behind the counter at A & E Bowery Lighting when someone asks. If you are weighing up two options and the listing does not settle it, ask: +1 212-219-3888 during opening hours, or service@bowerylights.shop, answered within one business day.
If you order from us
Standard shipping is a flat $11.95 anywhere in the United States, and it is free once the order passes $99. Weekday orders normally leave A & E Bowery Lighting the next working day, with three to seven business days in transit after that. Unopened items can go back within 30 days of delivery. Shipping Policy · Refund and Returns
Related sections of the shop
Related reading
- Base types: E26, GU10, G9 and how to identify yours – The base code is the one specification where being close is the same as being wrong.
- Lumens, watts and what actually makes a room bright – Wattage equivalence is a rough translation. Lumens is the measurement.
- Dimming LEDs: why some flicker and how to avoid it – Two components have to agree, and the bulb is only one of them.
Who wrote this
Written by the team at A & E Bowery Lighting, a lighting, bulbs and fixtures shop at 131 Bowery, New York, NY 10002. The guidance here is what we tell customers across the counter, and it is based on the products we actually stock and the questions we are actually asked. Where we are not certain of something, we say so rather than fill the gap. More about the shop · Contact us
