RAL 730-6 vs Thermal Spring
Where RAL 730-6 belongs to RAL Effect's range, Thermal Spring is a Sherwin-Williams color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. Thermal Spring (LRV 21) reflects noticeably more light than RAL 730-6 (LRV 17), a difference of 4 points that becomes especially apparent in rooms with limited natural light. The ΔE 5.1 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 730-6 vs Thermal Spring Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 730-6 on one side and Thermal Spring 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 730-6 comparisons
See how RAL 730-6 stacks up against other well-photographed colors across different brands and tones.
