RAL 620-3 vs Mountain Stream
RAL 620-3 (RAL Effect) and Mountain Stream (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. The 6-point LRV gap — 25 for Mountain Stream vs 20 for RAL 620-3 — means Mountain Stream will open up a space more effectively. ΔE 7.8 means they're clearly different, but not dramatically so — they'd pair well in the same room. 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 620-3 vs Mountain Stream Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 620-3 on one side and Mountain Stream 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 620-3 comparisons
See how RAL 620-3 stacks up against other well-photographed colors across different brands and tones.
