Přírodní bílá 4000 Kelvin LED žárovky

4000K natural white sits at the cool end of comfortable. It's daylight-adjacent without being clinical: clear enough for sustained task work, accurate enough for colour-critical applications, and neutral enough that it doesn't introduce the blue cast that higher colour temperatures produce. For home offices, studios, workshops, and commercial spaces, it's the colour temperature that prioritises visual clarity without sacrificing comfort.

Dulora's 4000K range covers a focused selection of GLS, candle, and GU10 spotlight forms across E27, E14, B22, and GU10 bases. CRI 90 to 95+ across the range, with select models reaching CRI 95+ for the clearest and most accurate task lighting. This is a limited range by design: 4000K is a task-specific temperature, not a whole-home default.

Every dimmable model works with a quality LED-rated dimmer. For the warmer 3000K alternative, see Soft White 3000K. For the broader warm white range, see Warm White 2700K.

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4000K Natural White: The Color Temperature for Clarity and Focus

Where does 4000K work better than warmer temperatures?

Home offices where sustained screen-adjacent work benefits from neutral ambient light. Workshops and utility rooms where accurate colour assessment of materials matters. Commercial retail spaces where merchandise needs to appear as it does in daylight. Kitchens where the cooking area is separated from the dining area and pure task performance is the priority.

4000K isn't recommended for living rooms, bedrooms, or any space where evening atmosphere is a consideration.

Is 4000K too cool for a residential setting?

In the right room, no. A home office with 4000K overhead lighting and 2700K in the adjoining living room creates a functional contrast that supports both work focus and evening relaxation. The key is not using 4000K in rooms where you want to feel at ease rather than alert.

Atmosphere, Illuminated.

Frequently Asked Questions: 4000K Natural White Bulbs

• What CRI rating do Dulora 4000K bulbs have?
• CRI 90 to 95+ across the range, with select models reaching CRI 95+ for the clearest and most accurate task lighting.
• What bulb forms are available in 4000K?
• GLS, candle, and GU10 spotlight forms in E27, E14, B22, and GU10 bases.
• Are Dulora 4000K bulbs safety certified?
• Yes. All 4000K bulbs are safety certified and covered by a three-year warranty.