Dulux Night Seas 27BB 10/138

Contents

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What are Dulux Night Seas undertones?
Is Night Seas 27BB 10/138 cool or warm?
How light temperature affects on Night Seas
Monochromatic color scheme
Complementary color scheme
Color comparison and matching
Color codes
Color equivalents

Code:	27BB 10/138
Name:	Night Seas
Brand:	Dulux

What color is Dulux Night Seas?

Dulux Night Seas 27BB 10/138 is a deep, muted blue with a noticeable grey cast, giving it a grounded, slate-like appearance rather than a bright nautical look. Its cool character reads clearly on large walls, where it can make a bedroom, study, or dining room feel more defined without appearing overly stark. In brighter daylight, the blue is more apparent; under warm evening lighting, this shade tends to look darker and more charcoal-blue. Use it for cabinetry, a single feature wall, or exterior trim alongside soft off-whites, pale stone, weathered oak, and brushed nickel. For a stronger contrast, pair Night Seas with warm clay, muted terracotta, or natural tan textiles.

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What are Dulux Night Seas undertones?

Night Seas is a deep, muted slate blue. The HEX sample leans blue; this describes its measurable digital hue direction, not a hidden paint pigment. Warm bulbs may gray the color down, while cool daylight usually makes its blue or teal direction clearer.

HEX value:

#3A5267

RGB code:

58, 82, 103

Is Dulux Night Seas cool or warm?

warm

cool

With a hue of 208°, this dark blue reads cool based on its HSL hue position.

27BB 10/138 Night Seas HSL code: 208, 28%, 32%

Hue - degree on a color wheel from 0 to 360. 0 is red, 120 is green, and 240 is blue.
Saturation is expressed as a percentage. At 0%, it appears as a shade of grey, and at 100%, it is in full color.
Lightness is also a percentage value. 0% is black, and 100% is white.

How light temperature affects Night Seas

Natural Lighting. During the day, natural light shifts from about 2000 K at sunrise/sunset to 5500–6500 K at noon.

Sunrise

Morning

Noon

Afternoon

Sunset

In addition, natural-light temperature depends on its direction:

Direction of sunlight	Visible temp.	Hue	Duration
North	Cool	Bluish	All day
East	Warm	Yellow	Before noon
West	Warm	Orange-red	After noon
South	Warm	Orange-yellow	All day

Artificial Lighting. When choosing bulbs, pay attention to their color temperature in Kelvins.
Use the slider to see how this dark blue shade looks under different lighting:

4000K

2000K

3000K

4000K

5000K

6000K

7000K

Coordinating colors.
Colors that go with Dulux Night Seas:

Monochromatic color scheme

This scheme consists of various shades, tints, and tones of a single color. While it offers a perfect combination of hues, without accent décor it may become monotonous.

Lighter shades

27BB 10/138
Night Seas

Complementary color scheme

This color scheme is a combination of two shades that are opposite each other on the color wheel. The high contrast between these colors creates a vibrant and dynamic visual effect. For the color Night Seas with a green hue, complementary colors are those with a red hue close to 28, such as Dulux Cocoa Blush 5 and Chalk Blush 3.

27BB 10/138
Night Seas

Compare
Dulux
Night Seas 27BB 10/138
to any other colors

Dulux
Night Seas 27BB 10/138
color equivalents

Color codes

We have collected almost every possible color code you could ever need.
Not sure what the difference between HEX and RGB is? We break down color models in plain language. Understanding color models

Format	Code
HEX	#3A5267
RGB Decimal	58, 82, 103
RGB Percent	22.75%, 32.16%, 40.39%
HSV	Hue: 208° Saturation: 43.69% Value: 40.39%
HSL	hsl(208, 28, 32)
CMYK	Cyan: 43.69 Magenta: 20.39 Yellow: 0.0 Key: 59.61
YIQ	Y: 77.218 I: -21.05 Q: 1.458
XYZ	X: 7.209 Y: 7.913 Z: 13.976
CIE Lab	L:33.801 a:-3.006 b:-15.023
CIE Luv	L:33.801 u:-11.431 v:-19.335
Decimal	3822183
Hunter Lab	28.13, -3.48, -9.766