Tranquil Dawn vs Portsmouth
Where Tranquil Dawn belongs to Dulux's range, Portsmouth is a Sherwin-Williams color. Hue-wise, Tranquil Dawn belongs to the green-grey family and Portsmouth to the blue-grey family. Tranquil Dawn (LRV 55) reflects noticeably more light than Portsmouth (LRV 22), a difference of 33 points that becomes especially apparent in rooms with limited natural light. Both lean neutral, so they'll behave similarly in mixed or changing light conditions. With a ΔE of 24.7, 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.
Tranquil Dawn vs Portsmouth in Real Spaces
1 real room side by side. Seeing Tranquil Dawn and Portsmouth in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Tranquil Dawn reflects noticeably more light off the walls, making the space read more open than Portsmouth.
Color Details
Tranquil Dawn vs Portsmouth Simulated Comparison
5 simulated room previews — drag the slider on each to see Tranquil Dawn on one side and Portsmouth 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 Tranquil Dawn comparisons
See how Tranquil Dawn stacks up against other well-photographed colors across different brands and tones.
