RAL 820-1 vs Sleepy Blue
RAL 820-1 (RAL Effect) and Sleepy Blue (Sherwin-Williams) come from different manufacturers. Hue-wise, RAL 820-1 belongs to the blue-grey family and Sleepy Blue to the blue family. Their light reflectance values are nearly the same — 57 vs 58 — so neither will read significantly brighter or darker than the other. ΔE 4.3 means they're clearly different, but not dramatically so — they'd pair well in the same room. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 820-1 vs Sleepy Blue in Real Spaces
2 real rooms side by side. RAL 820-1 and Sleepy Blue 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.
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. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
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. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
Color Details
RAL 820-1 vs Sleepy Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 820-1 on one side and Sleepy 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 RAL 820-1 comparisons
See how RAL 820-1 stacks up against other well-photographed colors across different brands and tones.
