RAL 640-2 vs K431
Where RAL 640-2 belongs to RAL Effect's range, K431 is a Tikkurila color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. K431 (LRV 18) reflects noticeably more light than RAL 640-2 (LRV 13), a difference of 5 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 16.4, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. 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 640-2 vs K431 Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 640-2 on one side and K431 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 640-2 comparisons
See how RAL 640-2 stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 13, White Dove is decisively the brighter choice.
Purbeck Stone reflects far more light (LRV 52 vs 13), opening up a space where RAL 640-2 encloses it.
Evergreen Fog reflects far more light (LRV 30 vs 13), opening up a space where RAL 640-2 encloses it.
Agreeable Gray reflects far more light (LRV 60 vs 13), opening up a space where RAL 640-2 encloses it.
At LRV 58 vs 13, Accessible Beige is decisively the brighter choice.
At LRV 27 vs 13, Denim Drift is decisively the brighter choice.
French Gray reflects far more light (LRV 43 vs 13), opening up a space where RAL 640-2 encloses it.
At LRV 55 vs 13, Tranquil Dawn is decisively the brighter choice.
At LRV 44 vs 13, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 13), opening up a space where RAL 640-2 encloses it.
At LRV 66 vs 13, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 13, Shoji White is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 13 vs 12), so neither reads brighter in a room.
A 5-point LRV gap (13 vs 8) makes RAL 640-2 the marginally brighter of the two.
At LRV 68 vs 13, Skimming Stone is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 13 vs 12), so neither reads brighter in a room.
At LRV 45 vs 13, Saybrook Sage is decisively the brighter choice.
Pale Green reflects far more light (LRV 31 vs 13), opening up a space where RAL 640-2 encloses it.