RAL 180-4 vs Rhythmic Blue
RAL 180-4 (RAL Effect) and Rhythmic Blue (Sherwin-Williams) come from different manufacturers. These are both blues, so the question isn't which hue to choose — it's where within blue to land. Their light reflectance values are nearly the same — 71 vs 69 — so neither will read significantly brighter or darker than the other. ΔE 3.4 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 180-4 vs Rhythmic Blue in Real Spaces
2 real rooms side by side. RAL 180-4 and Rhythmic 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.
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. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
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.
Color Details
RAL 180-4 vs Rhythmic Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 180-4 on one side and Rhythmic 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 180-4 comparisons
See how RAL 180-4 stacks up against other well-photographed colors across different brands and tones.
