LED Colour Temperature: 3000K vs 4000K vs 6500K

"Should I buy a 3000K, 4000K or 6500K bulb?" is a question we hear often. In this guide from Tawredaat (توريدات), an electrical and finishing materials store in Cairo and Giza (see also our FAQ), we explain what Kelvin means, which colour temperature suits each room at home and in a shop, the difference between colour and brightness, and common mistakes. At every step we say who the number comes from.

What does Kelvin mean, and how is light colour measured?

According to Wikipedia, colour temperature is a parameter describing the colour of a visible light source, measured in kelvins (K). It describes colour only, not the actual temperature of the bulb. ENERGY STAR explains that lower K means warmer, yellowish light and higher K means cooler, bluer light. TRILUX and Wikipedia put daylight at about 6500K.

"Cool" here means bluish in colour; it does not mean the bulb cools the room.

Common names and ranges (Louis Poulsen)

Note: brands use slightly different names, so rely on the Kelvin number printed on the bulb or in the product data, not on the name alone.

Which colour temperature for each room? (guideline table)

There is no single "correct" number for every home. This table collects what published sources say, with the source named next to each number. Where sources differ, we show the whole range.

This table is not a code or regulation

TRILUX, a European lighting company, states that the European lighting standards give no recommendations on the light colour of the light source, that the choice depends on the task, atmosphere, room colours and time of use, and that higher colour temperatures (daylight white) are preferred in warm climate zones. We did not find an Egyptian code text that sets a colour temperature per room, so the figures above are guidelines from named companies and utilities, and the final choice is your taste and the needs of the space.

Kelvin is not power: Kelvin vs watts vs lumens

• ✔ Kelvin (K): the colour of the light (warm or cool).
• ✔ Lumens (lm): the amount of light produced, i.e. brightness.
• ✔ Watts (W): the electrical power the lamp uses, not its brightness.

ENERGY STAR is explicit: "For brightness, look for lumens, not watts", and Focus on Energy says the same: check the light output in lumens on the label rather than the watts. Two bulbs of the same 3000K can differ in brightness if their lumens differ, and a 6500K bulb is not necessarily stronger than a 3000K one.

ENERGY STAR's table gives minimum lumens for common standard bulb wattages: 40 W = 450 lm, 60 W = 800, 75 W = 1,100, 100 W = 1,600, 150 W = 2,600. It refers to standard (old-style) bulbs and shows that watts are not a measure of brightness for modern lamps.

A note on our products: the listings on Tawredaat state wattage and the colour temperature (where available) but do not state lumens. If lumens matter to you, check the packaging or the manufacturer's data.

Common mistakes when choosing light colour

• ⚠ Mixing different colour temperatures in one room: BLT Direct advises matching all bulbs in the same room unless you have a particular reason, and SparksDirect says to keep colour consistent within each visual zone (its example: warm pendants beside cool kitchen task lighting in the same view looks inconsistent).
• ⚠ Cool white or daylight in the bedroom: SparksDirect says it can feel harsh late at night.
• ⚠ Buying by watts instead of lumens: see ENERGY STAR above.
• ⚠ Relying on the word "white" or "warm" only: names are not standardised, so look for the Kelvin number. For example, the Luma LED Lamp 5W White listing on Tawredaat says "white light" without a Kelvin value, so we cannot tell you its colour temperature.
• ⚠ Assuming there is a mandatory number: as TRILUX explains, European standards do not set one, and we found no Egyptian code that does.

Products at Tawredaat with a stated colour temperature

All of these were Active and in stock when this article was written. The details below come only from each product's description on Tawredaat. Any suggestion to use one in a particular place (such as a shop or storage room) is our own suggestion based on the sources above, not from the product description.

Warm white (3000K)

• Luma Floodlight 30W IP65 3000K Warm: described as an outdoor light for gardens, pathways and building facades with a warm light, with an IP65 weather-resistant rating.

Neutral white (4000K)

• Luma Polycarbonate Surface Mounted Luminaire 18W, 635×40×27 mm, IP65, 4000K: Samsung SMD LEDs and an opal diffuser for even, glare-reduced light; the description says it suits indoor and outdoor use.
• Luma Polycarbonate Surface Mounted Luminaire 36W, 1235×40×27 mm, IP65, 4000K: the same design in the longer, higher-power size.

Cool white / daylight (6000K and 6500K)

• Luma Polycarbonate Surface Mounted Luminaire 36W, IP65, 6000K: described as 6000K daylight and suitable for indoor and outdoor use.
• Luma Floodlight 400W IP65 6500K White: described as 6500K daylight, suited to outdoor areas, parking lots, warehouses and security lighting.

For ordinary household lamps, see the Luma LED Lamp 5W White (its page does not state a colour temperature, so ask or check the packaging before relying on a specific number), and browse the Lighting collection and the floodlights collection.

Related reading

• Emergency Lighting and Exit Signs: How to Choose Maintained or Non-maintained, 1 Hour or 3 Hours, for a Shop or Building
• Electrical Switches and Sockets: How to Choose the Right Ones?

In every case, final installation of lighting (especially in bathrooms, damp areas and outdoor floodlights) should be carried out by a qualified electrician or engineer.

Frequently asked questions

Which is better for a living room: 3000K or 4000K?
According to Energy Trust and SparksDirect, living rooms suit warm light around 2700K, and Louis Poulsen places 2700K to 3000K in the warm range. So 3000K is a good choice for a warm colour with a slightly livelier feel. More sources place 4000K in kitchens, offices and shops. In the end it is taste.

Is 6500K suitable for the home?
It can suit task areas: BLT Direct gives 4000K to 6500K for offices. But SparksDirect warns against it in bedrooms. It is closer to work areas and storage than to relaxing spaces.

Does a higher Kelvin mean brighter light?
No. Kelvin is the colour of the light; brightness is measured in lumens (ENERGY STAR).

Can I mix different colour temperatures in one room?
BLT Direct advises matching them unless you have a particular reason, and SparksDirect says consistency within each visual zone is key: if you mix, do it deliberately and for separate zones.

What is the difference between watts and lumens?
Watts are the power used; lumens are the amount of light. For brightness, look at lumens (ENERGY STAR).

Should I install the lighting myself?
Final installation should be done by a qualified electrician or engineer, especially in bathrooms, damp areas and outdoor floodlights.

Do you deliver?
Tawredaat delivers in Cairo and Giza only.

About Tawredaat: Tawredaat (توريدات) is an Egyptian supplier of electrical and finishing materials, serving homeowners, companies and contractors in Cairo and Giza. Questions? See our FAQ.

English summary: Colour temperature (Kelvin, K) describes the colour of light, not its brightness or power: lower K is warmer and yellowish, higher K is cooler and bluer (ENERGY STAR). Published guides from lighting suppliers and utilities suggest roughly 2700K-3000K for bedrooms and living rooms, 3000K-4000K for kitchens, 4000K-5000K for bathrooms, 4000K-6500K for offices, 4000K for general shops and about 5000K for warehouses. European lighting standards give no recommendation on light colour (TRILUX), so these are guidelines and personal preference, not rules. For brightness look at lumens, not watts, and avoid mixing different colour temperatures in the same room. Final installation should be done by a qualified electrician or engineer.

Sources

• ENERGY STAR, Light Bulb Purchasing Guide (16 Mar 2020): lower K means warmer, yellowish light and higher K cooler, bluer light; 'For brightness, look for lumens, not watts'; minimum lumens for common standard bulb wattages (40 W = 450 lm, 60 W = 800 lm, 75 W = 1,100 lm, 100 W = 1,600 lm, 150 W = 2,600 lm) — energystar.gov/sites/default/files/asset/document/Light%20Bulb%20Purchasing%20Guide_16Mar2020.pdf
• Louis Poulsen, Colour temperature (warm/soft 2700K-3000K, bright cooler white 3500K-4100K, daylight 5000K-6500K; warm light relaxes, cooler white and daylight support attentiveness; a lighting manufacturer's page, it does not assign ranges to rooms) — louispoulsen.com/en/professional/colour-temperature
• Energy Trust of Oregon, Color matters when choosing light bulbs (Energy Trust Insider, 4 Apr 2017): lighting ranges from about 2200K to 6500K; about 2700K for living rooms, bedrooms and dining rooms; about 3500K for kitchens and work spaces; 5000K for reading lights and desk lamps — insider.energytrust.org/color-matters-choosing-light-bulbs/
• Focus on Energy (Wisconsin utility programme), Finding the Perfect Lightbulb for Your Home (lower K warmer, higher K cooler; warmer bulbs for relaxing in living room and bedroom, cooler for kitchen or bathroom; use lumens, not watts, on the label) — focusonenergy.com/blog/finding-the-perfect-lightbulb-for-your-home
• TRILUX, Light colour (light colour is expressed as the closest colour temperature; daylight is about 6,500 K; the European lighting standards give no recommendations on light colours of the light source; higher colour temperatures are preferred in warm climate zones; the choice depends on task, aesthetics, room and time of use) — trilux.com/en/lighting-practice/lighting-equipment/light-sources/characteristics-of-light-sources/light-colour
• Wikipedia, Color temperature (a parameter describing the colour of a light source, measured in kelvins; it describes colour, not the actual temperature of the source; daylight is about 6,500 K) — en.wikipedia.org/wiki/Color_temperature
• SparksDirect (UK lighting retailer), What colour temperature should your lights be? (bedroom 2700K, living room 2700K, kitchen 3000K-4000K, bathroom 4000K, home office 4000K; avoid cool white or daylight in the bedroom; keep colour temperature consistent within each visual zone) — sparksdirect.co.uk/blog/what-colour-temperature-lights-room-by-room-guide-led-lighting
• BLT Direct (UK lighting retailer), What LED colour temperature is best for a bedroom, kitchen, bathroom or office (bedroom 2700K-3000K, kitchen about 4000K, bathroom 4000K-5000K, office usually 4000K-6500K; match the colour temperature of all LED bulbs within the same room unless you have a particular reason) — bltdirect.com/what-led-colour-temperature-is-best-for-a-bedroom-kitchen-bathroom-or-office
• Beyond LED Technology (LED supplier), 5000K vs 4000K vs 3000K: Best Color Temperature for Commercial Spaces (general retail 4000K, boutiques and fashion 3000K, offices 4000K, warehouses 5000K) — beyondledtechnology.com/blogs/news/5000k-vs-4000k-vs-3000k-best-color-temperature-for-commercial-spaces
• Warehouse-Lighting.com (US lighting retailer), Which color temperature is best for Warehouse Lighting? (5000K typical for warehouses and industrial spaces; 4000K an optimum choice for offices and retail) — warehouse-lighting.com/blogs/lighting-blog/4000k-vs-5000k-led-lights-for-warehouses
• Tawredaat product listings (colour temperature, wattage, size and IP rating are taken only from the listings on tawredaat.com; the listings do not state lumens) — tawredaat.com/collections/lighting