Vast Lake vs Grey Blue
Vast Lake (Dulux) and Grey Blue (RAL Classic) come from different manufacturers. Hue-wise, Vast Lake belongs to the blue family and Grey Blue to the blue-grey family. The 23-point LRV gap — 31 for Vast Lake vs 7 for Grey Blue — means Vast Lake will open up a space more effectively. A ΔE of 31.0 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Vast Lake vs Grey Blue in Real Spaces
2 real rooms side by side. Seeing Vast Lake and Grey Blue in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
House
A full exterior is the most demanding test for a paint color — scale and outdoor light both amplify differences that seem small on a swatch. Vast Lake returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Front Door
On a front door, the color is both the first and last thing you see — a context where even a modest tonal difference reads clearly. Vast Lake reflects noticeably more light off the walls, making the space read more open than Grey Blue.
Color Details
Vast Lake vs Grey Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Vast Lake on one side and Grey Blue 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 Vast Lake comparisons
See how Vast Lake stacks up against other well-photographed colors across different brands and tones.
