RAL 820-4 vs Foggy Day
RAL 820-4 (RAL Effect) and Foggy Day (Sherwin-Williams) come from different manufacturers. Both sit in the blue-grey family, which is useful context if you're narrowing within a single hue direction. The 3-point LRV gap — 23 for RAL 820-4 vs 20 for Foggy Day — means RAL 820-4 will open up a space more effectively. ΔE 3.8 means they're clearly different, but not dramatically so — they'd pair well in the same room. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 820-4 vs Foggy Day in Real Spaces
3 real rooms side by side. RAL 820-4 and Foggy Day are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
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. RAL 820-4 reads slightly lighter here — a subtle but real difference in how open the space feels.
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. RAL 820-4 has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
Kitchen Cabinets
Cabinet color is always seen in context — against countertops, backsplash, and hardware — which amplifies undertone differences that might disappear on a plain wall. RAL 820-4 has the edge in reflectance, which shows as a quiet sense of added space rather than an obvious contrast.
Color Details
RAL 820-4 vs Foggy Day Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 820-4 on one side and Foggy Day 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 RAL 820-4 comparisons
See how RAL 820-4 stacks up against other well-photographed colors across different brands and tones.
