RAL 660-5 vs Slick Blue
Where RAL 660-5 belongs to RAL Effect's range, Slick 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. Slick Blue (LRV 52) reflects noticeably more light than RAL 660-5 (LRV 41), a difference of 11 points that becomes especially apparent in rooms with limited natural light. The ΔE 4.2 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 660-5 vs Slick Blue in Real Spaces
2 real rooms side by side. RAL 660-5 and Slick 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.
Living Room
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. The LRV gap is large enough that Slick Blue will make the room feel meaningfully brighter than RAL 660-5 would.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Slick Blue reflects noticeably more light off the walls, making the space read more open than RAL 660-5.
Color Details
RAL 660-5 vs Slick Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 660-5 on one side and Slick 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 660-5 comparisons
See how RAL 660-5 stacks up against other well-photographed colors across different brands and tones.
