Cement grey vs RAL 820-5
Cement grey (RAL Classic) and RAL 820-5 (RAL Effect) come from different manufacturers. Hue-wise, Cement grey belongs to the grey family and RAL 820-5 to the blue-grey family. The 15-point LRV gap — 24 for Cement grey vs 9 for RAL 820-5 — means Cement grey will open up a space more effectively. A ΔE of 21.7 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Cement grey vs RAL 820-5 in Real Spaces
4 real rooms side by side. Seeing Cement grey and RAL 820-5 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. Cement grey reflects noticeably more light off the walls, making the space read more open than RAL 820-5.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Cement grey returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. Cement grey returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
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. Cement grey returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Cement grey vs RAL 820-5 Simulated Comparison
5 simulated room previews — drag the slider on each to see Cement grey on one side and RAL 820-5 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 Cement grey comparisons
See how Cement grey stacks up against other well-photographed colors across different brands and tones.
