RAL 620-4 vs Thames Fog
RAL 620-4 (RAL Effect) and Thames Fog (Valspar) come from different manufacturers. Hue-wise, RAL 620-4 belongs to the blue family and Thames Fog to the grey family. The 19-point LRV gap — 27 for Thames Fog vs 9 for RAL 620-4 — means Thames Fog will open up a space more effectively. A ΔE of 30.7 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 620-4 vs Thames Fog in Real Spaces
3 real rooms side by side. Seeing RAL 620-4 and Thames Fog in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Thames Fog reflects noticeably more light off the walls, making the space read more open than RAL 620-4.
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. Thames Fog returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
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. Thames Fog returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
RAL 620-4 vs Thames Fog Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 620-4 on one side and Thames Fog 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 620-4 comparisons
See how RAL 620-4 stacks up against other well-photographed colors across different brands and tones.
