Cosmic Cobalt vs Tranquil Dawn
Where Cosmic Cobalt belongs to Behr's range, Tranquil Dawn is a Dulux color. Hue-wise, Cosmic Cobalt belongs to the blue family and Tranquil Dawn to the green-grey family. Tranquil Dawn (LRV 55) reflects noticeably more light than Cosmic Cobalt (LRV 10), a difference of 45 points that becomes especially apparent in rooms with limited natural light. Cosmic Cobalt runs blue while Tranquil Dawn is decidedly neutral, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 51.8, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Cosmic Cobalt vs Tranquil Dawn in Real Spaces
1 real room side by side. Seeing Cosmic Cobalt and Tranquil Dawn in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Home Office
The test for a home office color isn't how it looks in a quick glance — it's whether it still feels right after a full day of work. Tranquil Dawn reflects noticeably more light off the walls, making the space read more open than Cosmic Cobalt.
Color Details
Cosmic Cobalt vs Tranquil Dawn Simulated Comparison
5 simulated room previews — drag the slider on each to see Cosmic Cobalt on one side and Tranquil Dawn on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Cosmic Cobalt comparisons
See how Cosmic Cobalt stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 10), opening up a space where Cosmic Cobalt encloses it.
At LRV 69 vs 10, Ammonite is decisively the brighter choice.
Cosmic Cobalt reads slightly lighter (LRV 10 vs 6), a gap that shows most in low-lit rooms.
At LRV 52 vs 10, Purbeck Stone is decisively the brighter choice.
At LRV 30 vs 10, Evergreen Fog is decisively the brighter choice.
Mizzle reflects far more light (LRV 52 vs 10), opening up a space where Cosmic Cobalt encloses it.
At LRV 60 vs 10, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 10), opening up a space where Cosmic Cobalt encloses it.
Denim Drift reflects far more light (LRV 27 vs 10), opening up a space where Cosmic Cobalt encloses it.
At LRV 43 vs 10, French Gray is decisively the brighter choice.
A 5-point LRV gap (10 vs 4) makes Cosmic Cobalt the marginally brighter of the two.
Bancha reads slightly lighter (LRV 13 vs 10), a gap that shows most in low-lit rooms.
Hardwick White reflects far more light (LRV 44 vs 10), opening up a space where Cosmic Cobalt encloses it.
At LRV 84 vs 10, Pure White is decisively the brighter choice.
A 12-point LRV gap (21 vs 10) makes Artichoke the marginally brighter of the two.
Balboa Mist reflects far more light (LRV 66 vs 10), opening up a space where Cosmic Cobalt encloses it.
Shoji White reflects far more light (LRV 74 vs 10), opening up a space where Cosmic Cobalt encloses it.
Snowbound reflects far more light (LRV 83 vs 10), opening up a space where Cosmic Cobalt encloses it.
With LRVs of 12 and 10, the two reflect almost the same amount of light.
Skimming Stone reflects far more light (LRV 68 vs 10), opening up a space where Cosmic Cobalt encloses it.
At LRV 41 vs 10, Dix Blue is decisively the brighter choice.
At LRV 68 vs 10, Calamine is decisively the brighter choice.
At LRV 25 vs 10, Treron is decisively the brighter choice.
With LRVs of 12 and 10, the two reflect almost the same amount of light.
Saybrook Sage reflects far more light (LRV 45 vs 10), opening up a space where Cosmic Cobalt encloses it.
At LRV 31 vs 10, Pale Green is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 10 vs 7), so neither reads brighter in a room.
At LRV 24 vs 10, Cement grey is decisively the brighter choice.
At LRV 57 vs 10, Guilford Green is decisively the brighter choice.
At LRV 72 vs 10, Just Walnut is decisively the brighter choice.