Tranquil Dawn vs Ionian
Where Tranquil Dawn belongs to Dulux's range, Ionian is a Sherwin-Williams color. Tranquil Dawn reads as green-grey, while Ionian reads as blue — two distinct hue families, not close cousins. Tranquil Dawn (LRV 55) reflects noticeably more light than Ionian (LRV 20), a difference of 35 points that becomes especially apparent in rooms with limited natural light. Tranquil Dawn runs neutral while Ionian is decidedly cool, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 37.0, 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 Ionian in Real Spaces
1 real room side by side. Seeing Tranquil Dawn and Ionian in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. Tranquil Dawn reflects noticeably more light off the walls, making the space read more open than Ionian.
Color Details
Tranquil Dawn vs Ionian Simulated Comparison
5 simulated room previews — drag the slider on each to see Tranquil Dawn on one side and Ionian 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.
