Thunderbolt vs RAL 820-4
Thunderbolt is a PPG color while RAL 820-4 comes from RAL Effect. Hue-wise, Thunderbolt belongs to the grey family and RAL 820-4 to the blue-grey family. With LRVs of 23 and 23, they'll behave almost identically in terms of how much light they reflect back into a room. At ΔE 4.8, the difference is perceptible but not dramatic — the two can work harmoniously in the same space. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Thunderbolt vs RAL 820-4 Simulated Comparison
5 simulated room previews — drag the slider on each to see Thunderbolt on one side and RAL 820-4 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 Thunderbolt comparisons
See how Thunderbolt stacks up against other well-photographed colors across different brands and tones.
