Vast Lake vs Cement grey
Vast Lake (Dulux) and Cement grey (RAL Classic) come from different manufacturers. Hue-wise, Vast Lake belongs to the blue family and Cement grey to the grey family. The 6-point LRV gap — 31 for Vast Lake vs 24 for Cement grey — means Vast Lake will open up a space more effectively. A ΔE of 21.6 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Vast Lake vs Cement grey in Real Spaces
3 real rooms side by side. Seeing Vast Lake and Cement grey in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Vast Lake reads slightly lighter here — a subtle but real difference in how open the space feels.
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 has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
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 reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
Vast Lake vs Cement grey Simulated Comparison
5 simulated room previews — drag the slider on each to see Vast Lake on one side and Cement grey 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.
At LRV 83 vs 31, White Dove is decisively the brighter choice.
Purbeck Stone reflects far more light (LRV 52 vs 31), opening up a space where Vast Lake encloses it.
With LRVs of 31 and 30, the two reflect almost the same amount of light.
Agreeable Gray reflects far more light (LRV 60 vs 31), opening up a space where Vast Lake encloses it.
At LRV 58 vs 31, Accessible Beige is decisively the brighter choice.
A 4-point LRV gap (31 vs 27) makes Vast Lake the marginally brighter of the two.
French Gray reflects far more light (LRV 43 vs 31), opening up a space where Vast Lake encloses it.
At LRV 55 vs 31, Tranquil Dawn is decisively the brighter choice.
At LRV 44 vs 31, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 31), opening up a space where Vast Lake encloses it.
At LRV 66 vs 31, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 31, Shoji White is decisively the brighter choice.
At LRV 31 vs 12, Vast Lake is decisively the brighter choice.
At LRV 68 vs 31, Skimming Stone is decisively the brighter choice.
At LRV 31 vs 12, Vast Lake is decisively the brighter choice.
At LRV 45 vs 31, Saybrook Sage is decisively the brighter choice.
With LRVs of 31 and 31, the two reflect almost the same amount of light.
Vast Lake reflects far more light (LRV 31 vs 7), opening up a space where Pine Needle encloses it.
Guilford Green reflects far more light (LRV 57 vs 31), opening up a space where Vast Lake encloses it.
Just Walnut reflects far more light (LRV 72 vs 31), opening up a space where Vast Lake encloses it.