RAL 180-4 vs Rhythmic Blue
RAL 180-4 (RAL Effect) and Rhythmic Blue (Sherwin-Williams) come from different manufacturers. These are both blues, so the question isn't which hue to choose — it's where within blue to land. Their light reflectance values are nearly the same — 71 vs 69 — so neither will read significantly brighter or darker than the other. ΔE 3.4 means they're clearly different, but not dramatically so — they'd pair well in the same room. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 180-4 vs Rhythmic Blue in Real Spaces
2 real rooms side by side. RAL 180-4 and Rhythmic 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.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. At this scale, the choice between them becomes clear in a way that a swatch alone can't communicate.
Color Details
RAL 180-4 vs Rhythmic Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 180-4 on one side and Rhythmic 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 180-4 comparisons
See how RAL 180-4 stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 71), opening up a space where RAL 180-4 encloses it.
At LRV 71 vs 52, RAL 180-4 is decisively the brighter choice.
At LRV 71 vs 30, RAL 180-4 is decisively the brighter choice.
A 10-point LRV gap (71 vs 60) makes RAL 180-4 the marginally brighter of the two.
RAL 180-4 reflects far more light (LRV 71 vs 58), opening up a space where Accessible Beige encloses it.
RAL 180-4 reflects far more light (LRV 71 vs 27), opening up a space where Denim Drift encloses it.
At LRV 71 vs 43, RAL 180-4 is decisively the brighter choice.
RAL 180-4 reflects far more light (LRV 71 vs 55), opening up a space where Tranquil Dawn encloses it.
RAL 180-4 reflects far more light (LRV 71 vs 44), opening up a space where Hardwick White encloses it.
At LRV 84 vs 71, Pure White is decisively the brighter choice.
RAL 180-4 reads slightly lighter (LRV 71 vs 66), a gap that shows most in low-lit rooms.
Shoji White reads slightly lighter (LRV 74 vs 71), a gap that shows most in low-lit rooms.
RAL 180-4 reflects far more light (LRV 71 vs 12), opening up a space where Pewter Green encloses it.
With LRVs of 71 and 68, the two reflect almost the same amount of light.
RAL 180-4 reflects far more light (LRV 71 vs 12), opening up a space where Vintage Vogue encloses it.
RAL 180-4 reflects far more light (LRV 71 vs 45), opening up a space where Saybrook Sage encloses it.
At LRV 71 vs 31, RAL 180-4 is decisively the brighter choice.
At LRV 71 vs 7, RAL 180-4 is decisively the brighter choice.
At LRV 71 vs 24, RAL 180-4 is decisively the brighter choice.
At LRV 71 vs 57, RAL 180-4 is decisively the brighter choice.