Seaside Blue vs RAL 660-6
Where Seaside Blue belongs to Benjamin Moore's range, RAL 660-6 is a RAL Effect 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 (47 vs 47), so they'll read as similarly Medium in most lighting conditions. The ΔE 3.2 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.
Color Details
Seaside Blue vs RAL 660-6 Simulated Comparison
5 simulated room previews — drag the slider on each to see Seaside Blue on one side and RAL 660-6 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 Seaside Blue comparisons
See how Seaside Blue stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 47, White Dove is decisively the brighter choice.
Ammonite reflects far more light (LRV 69 vs 47), opening up a space where Seaside Blue encloses it.
At LRV 47 vs 6, Seaside Blue is decisively the brighter choice.
Purbeck Stone reads slightly lighter (LRV 52 vs 47), a gap that shows most in low-lit rooms.
Seaside Blue reflects far more light (LRV 47 vs 30), opening up a space where Evergreen Fog encloses it.
A 4-point LRV gap (52 vs 47) makes Mizzle the marginally brighter of the two.
Agreeable Gray reflects far more light (LRV 60 vs 47), opening up a space where Seaside Blue encloses it.
A 10-point LRV gap (58 vs 47) makes Accessible Beige the marginally brighter of the two.
At LRV 47 vs 27, Seaside Blue is decisively the brighter choice.
Seaside Blue reads slightly lighter (LRV 47 vs 43), a gap that shows most in low-lit rooms.
Seaside Blue reflects far more light (LRV 47 vs 4), opening up a space where Naval encloses it.
A 8-point LRV gap (55 vs 47) makes Tranquil Dawn the marginally brighter of the two.
At LRV 47 vs 13, Seaside Blue is decisively the brighter choice.
A 4-point LRV gap (47 vs 44) makes Seaside Blue the marginally brighter of the two.
Pure White reflects far more light (LRV 84 vs 47), opening up a space where Seaside Blue encloses it.
Seaside Blue reflects far more light (LRV 47 vs 21), opening up a space where Artichoke encloses it.
At LRV 66 vs 47, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 47, Shoji White is decisively the brighter choice.
At LRV 83 vs 47, Snowbound is decisively the brighter choice.
At LRV 47 vs 12, Seaside Blue is decisively the brighter choice.
At LRV 68 vs 47, Skimming Stone is decisively the brighter choice.
Seaside Blue reads slightly lighter (LRV 47 vs 41), a gap that shows most in low-lit rooms.
Calamine reflects far more light (LRV 68 vs 47), opening up a space where Seaside Blue encloses it.
Seaside Blue reflects far more light (LRV 47 vs 25), opening up a space where Treron encloses it.
At LRV 47 vs 12, Seaside Blue is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 47 vs 45), so neither reads brighter in a room.
Seaside Blue reflects far more light (LRV 47 vs 31), opening up a space where Pale Green encloses it.
Seaside Blue reflects far more light (LRV 47 vs 7), opening up a space where Pine Needle encloses it.
Seaside Blue reflects far more light (LRV 47 vs 24), opening up a space where Cement grey encloses it.
Guilford Green reads slightly lighter (LRV 57 vs 47), a gap that shows most in low-lit rooms.