Sky blue vs RAL 640-3
Where Sky blue belongs to RAL Classic's range, RAL 640-3 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. Sky blue (LRV 19) reflects noticeably more light than RAL 640-3 (LRV 11), a difference of 8 points that becomes especially apparent in rooms with limited natural light. At ΔE 0.4, these are close — the kind of difference that matters when choosing between them, but doesn't read strongly in a finished room. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Sky blue vs RAL 640-3 in Real Spaces
1 real room side by side. Sky blue and RAL 640-3 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.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. Sky blue reflects noticeably more light off the walls, making the space read more open than RAL 640-3.
Color Details
Sky blue vs RAL 640-3 Simulated Comparison
5 simulated room previews — drag the slider on each to see Sky blue on one side and RAL 640-3 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 Sky blue comparisons
See how Sky blue stacks up against other well-photographed colors across different brands and tones.
