RAL 660-1 vs L366
Where RAL 660-1 belongs to RAL Effect's range, L366 is a Tikkurila color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. They have nearly identical light reflectance values (15 vs 15), so they'll read as similarly Dark in most lighting conditions. With a ΔE of 12.3, 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 660-1 vs L366 Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 660-1 on one side and L366 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 660-1 comparisons
See how RAL 660-1 stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 15), opening up a space where RAL 660-1 encloses it.
At LRV 52 vs 15, Purbeck Stone is decisively the brighter choice.
At LRV 30 vs 15, Evergreen Fog is decisively the brighter choice.
At LRV 60 vs 15, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 15), opening up a space where RAL 660-1 encloses it.
Denim Drift reflects far more light (LRV 27 vs 15), opening up a space where RAL 660-1 encloses it.
At LRV 43 vs 15, French Gray is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 15), opening up a space where RAL 660-1 encloses it.
Hardwick White reflects far more light (LRV 44 vs 15), opening up a space where RAL 660-1 encloses it.
At LRV 84 vs 15, Pure White is decisively the brighter choice.
Balboa Mist reflects far more light (LRV 66 vs 15), opening up a space where RAL 660-1 encloses it.
Shoji White reflects far more light (LRV 74 vs 15), opening up a space where RAL 660-1 encloses it.
RAL 660-1 reads slightly lighter (LRV 15 vs 12), a gap that shows most in low-lit rooms.
RAL 660-1 reads slightly lighter (LRV 15 vs 8), a gap that shows most in low-lit rooms.
Skimming Stone reflects far more light (LRV 68 vs 15), opening up a space where RAL 660-1 encloses it.
With LRVs of 15 and 12, the two reflect almost the same amount of light.
Saybrook Sage reflects far more light (LRV 45 vs 15), opening up a space where RAL 660-1 encloses it.
At LRV 31 vs 15, Pale Green is decisively the brighter choice.