RAL 740-6 vs Poseidon
Where RAL 740-6 belongs to RAL Effect's range, Poseidon 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. Poseidon (LRV 11) reflects noticeably more light than RAL 740-6 (LRV 6), a difference of 6 points that becomes especially apparent in rooms with limited natural light. The ΔE 6.8 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
RAL 740-6 vs Poseidon in Real Spaces
2 real rooms side by side. RAL 740-6 and Poseidon 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.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. Poseidon reads slightly lighter here — a subtle but real difference in how open the space feels.
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. Poseidon reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
RAL 740-6 vs Poseidon Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 740-6 on one side and Poseidon 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 740-6 comparisons
See how RAL 740-6 stacks up against other well-photographed colors across different brands and tones.
White Dove reflects far more light (LRV 83 vs 6), opening up a space where RAL 740-6 encloses it.
At LRV 52 vs 6, Purbeck Stone is decisively the brighter choice.
At LRV 30 vs 6, Evergreen Fog is decisively the brighter choice.
At LRV 60 vs 6, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 6), opening up a space where RAL 740-6 encloses it.
Denim Drift reflects far more light (LRV 27 vs 6), opening up a space where RAL 740-6 encloses it.
At LRV 43 vs 6, French Gray is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 6), opening up a space where RAL 740-6 encloses it.
Hardwick White reflects far more light (LRV 44 vs 6), opening up a space where RAL 740-6 encloses it.
At LRV 84 vs 6, Pure White is decisively the brighter choice.
Balboa Mist reflects far more light (LRV 66 vs 6), opening up a space where RAL 740-6 encloses it.
Shoji White reflects far more light (LRV 74 vs 6), opening up a space where RAL 740-6 encloses it.
Pewter Green reads slightly lighter (LRV 12 vs 6), a gap that shows most in low-lit rooms.
With LRVs of 8 and 6, the two reflect almost the same amount of light.
Skimming Stone reflects far more light (LRV 68 vs 6), opening up a space where RAL 740-6 encloses it.
Vintage Vogue reads slightly lighter (LRV 12 vs 6), a gap that shows most in low-lit rooms.
Saybrook Sage reflects far more light (LRV 45 vs 6), opening up a space where RAL 740-6 encloses it.
At LRV 31 vs 6, Pale Green is decisively the brighter choice.