RAL 640-4 vs Jay Blue
Where RAL 640-4 belongs to RAL Effect's range, Jay Blue is a Sherwin-Williams color. These are both blues, so the question isn't which hue to choose — it's where within blue to land. Jay Blue (LRV 9) reflects noticeably more light than RAL 640-4 (LRV 7), a difference of 3 points that becomes especially apparent in rooms with limited natural light. The ΔE 4.1 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
RAL 640-4 vs Jay Blue in Real Spaces
1 real room side by side. RAL 640-4 and Jay Blue are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Color Details
RAL 640-4 vs Jay Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 640-4 on one side and Jay Blue 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 640-4 comparisons
See how RAL 640-4 stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 7, White Dove is decisively the brighter choice.
Purbeck Stone reflects far more light (LRV 52 vs 7), opening up a space where RAL 640-4 encloses it.
Evergreen Fog reflects far more light (LRV 30 vs 7), opening up a space where RAL 640-4 encloses it.
Agreeable Gray reflects far more light (LRV 60 vs 7), opening up a space where RAL 640-4 encloses it.
At LRV 58 vs 7, Accessible Beige is decisively the brighter choice.
At LRV 27 vs 7, Denim Drift is decisively the brighter choice.
French Gray reflects far more light (LRV 43 vs 7), opening up a space where RAL 640-4 encloses it.
At LRV 55 vs 7, Tranquil Dawn is decisively the brighter choice.
At LRV 44 vs 7, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 7), opening up a space where RAL 640-4 encloses it.
At LRV 66 vs 7, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 7, Shoji White is decisively the brighter choice.
A 5-point LRV gap (12 vs 7) makes Pewter Green the marginally brighter of the two.
Their light reflectance is nearly identical (LRV 8 vs 7), so neither reads brighter in a room.
At LRV 68 vs 7, Skimming Stone is decisively the brighter choice.
A 5-point LRV gap (12 vs 7) makes Vintage Vogue the marginally brighter of the two.
At LRV 45 vs 7, Saybrook Sage is decisively the brighter choice.
Pale Green reflects far more light (LRV 31 vs 7), opening up a space where RAL 640-4 encloses it.