RAL 660-1 vs Resonant Blue
Where RAL 660-1 belongs to RAL Effect's range, Resonant Blue is a Sherwin-Williams color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. Resonant Blue (LRV 30) reflects noticeably more light than RAL 660-1 (LRV 15), a difference of 15 points that becomes especially apparent in rooms with limited natural light. The ΔE 6.8 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
RAL 660-1 vs Resonant Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 660-1 on one side and Resonant 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 660-1 comparisons
See how RAL 660-1 stacks up against other well-photographed colors across different brands and tones.
