Colour Temperature Guide: 2700K, 3000K, 4000K, 5000K Explained
2700K is warm, 5000K is daylight — and the four-digit number on the box decides how every room feels. The room-by-room chart, the CRI companion spec, CCT-selectable fixtures, and the mixing rules that keep a house looking intentional.
Colour temperature (Kelvin) describes how warm or cool light looks. 2700K–3000K is warm (living rooms, bedrooms), 3500K–4000K is neutral (kitchens, bathrooms, offices), 5000K is crisp daylight (workshops, garages). Match the temperature to the room's job, keep it consistent within a room, and check CRI (90+) where colour accuracy matters.
What the Kelvin number actually means
The scale comes from physics — the colour a reference object glows when heated to that temperature. Practical translation: lower Kelvin = warmer/more orange (candlelight ≈ 1800K, incandescent ≈ 2700K), higher = cooler/bluer (noon daylight ≈ 5000–6500K). Counterintuitively, "warmer" light has a lower temperature number. The number says nothing about brightness — that's lumens (Lumens vs Watts).
Room-by-room chart
| Room | Recommended | Why |
|---|---|---|
| Living room / bedroom | 2700–3000K | Warm, relaxing, flattering |
| Kitchen | 3000–4000K | Clean task light; warmer over eating zones |
| Bathroom | 3000–3500K, CRI 90+ | Accurate, flattering at the mirror |
| Office / laundry | 3500–4000K | Alert without harshness |
| Garage / workshop | 4000–5000K | Maximum clarity, true colour |
| Outdoor — entertaining | 2700–3000K | Inviting, less insect-attracting glare |
| Outdoor — security | 4000–5000K | Visibility and camera contrast |
The mood-first version of this decision — combining CCT with brightness, layering, and dimming — is our companion guide: The Lighting Vibe Check.
CRI: the spec hiding behind the temperature
Two 3000K bulbs can render colour very differently. CRI (Colour Rendering Index, 0–100) measures accuracy: 80 is builder-standard; 90+ makes food, skin, wood, and paint look right. Kitchens, bathrooms, vanities, and art walls justify 90+. Low CRI is why a renovated room can feel "off" under brand-new lights.
CCT-selectable fixtures: pick the temperature at install
Most current wafers, downlights, and many fixtures are CCT-selectable — a physical switch chooses 2700K/3000K/3500K/4000K/5000K at installation. One SKU stocks every room; set it once and forget it. Two rules: set every unit in a room to the same temperature, and note the setting somewhere (future-you, replacing one unit in five years, will thank you). Browse LED downlights, NEXLEDS, and EiKO — Maple lists CCT options on every product page, from authorized-reseller stock.
The mixing rules
1. One temperature per room. A single 4000K bulb in a 2700K room reads as a mistake from the doorway. 2. Transitions can shift gradually — 2700K living room → 3000K hallway → 3500K kitchen feels natural; 2700K → 5000K through a doorway feels like a hospital wing. 3. Within sight lines, stay consistent. Open-concept spaces should hold one temperature across zones (vary brightness and layers instead). 4. Match brands within a room where possible — "3000K" varies slightly between manufacturers, and CRI differences show. 5. Dimming warm-dim products: some LEDs warm as they dim (incandescent-style); standard LEDs hold their CCT while dimming. Decide which behaviour you want in living spaces.
Common mistakes
Mixing temperatures in one room · 5000K in living spaces (clinical) · ignoring CRI · assuming all "soft white" matches across brands · buying fixed-CCT when selectable cost the same · forgetting dimmer compatibility (flicker guide).
Frequently asked questions
Is 4000K too cold for a kitchen?
No — 3500–4000K is a popular kitchen choice for clean task light. Keep eating areas warmer (2700–3000K pendant over the table) and it balances beautifully.
What's the most popular colour temperature for homes?
3000K (soft white) is the most common all-round choice in Canadian homes — warm enough to relax, neutral enough for tasks.
Does colour temperature affect brightness?
No — that's lumens. Temperature changes the look, not the output. See Lumens vs Watts.
Why don't my "daylight" bulbs match each other?
Brand variance and CRI differences. Buy the same brand/spec within a room, or use CCT-selectable fixtures set identically.
What colour temperature is best for outdoor lights?
2700–3000K for entertaining and curb appeal; 4000K+ where visibility/security is the goal. Many municipalities and dark-sky guidelines favour warmer outdoor lighting.
Can I dim warm and cool bulbs the same way?
Dimming depends on the bulb-dimmer pairing, not the CCT. Check compatibility lists — mismatch is the #1 cause of flicker.
What's "warm dim" or "dim-to-warm"?
LEDs engineered to shift warmer (like incandescents) as they dim — premium feature for dining and living rooms.
- ENERGY STAR Canada — certified lighting criteria: natural-resources.canada.ca/energy-efficiency/energy-star-canada
- Natural Resources Canada — residential lighting: natural-resources.canada.ca
- Manufacturer photometric datasheets (CCT/CRI per product)
Not sure which colour temperature suits your space? Send Maple your room and we'll recommend bulbs and fixtures. Ask Maple
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