Reef Blue vs RAL 670-3
Where Reef Blue belongs to Behr's range, RAL 670-3 is a RAL Effect color. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. They have nearly identical light reflectance values (45 vs 47), so they'll read as similarly Medium in most lighting conditions. The ΔE 4.3 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 6 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Reef Blue vs RAL 670-3 in Real Spaces
6 real rooms side by side. Reef Blue and RAL 670-3 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.
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. Side by side like this, the difference is easy to read — which is exactly why seeing them in a real space is more useful than comparing chips.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. The distinction reads clearly at room scale, making the choice between them concrete.
Kitchen
In a kitchen, colors are seen under bright task lighting that amplifies undertones — what reads neutral elsewhere can show its hand here. The distinction reads clearly at room scale, making the choice between them concrete.
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. The distinction reads clearly at room scale, making the choice between them concrete.
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. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
Reef Blue vs RAL 670-3 Simulated Comparison
5 simulated room previews — drag the slider on each to see Reef Blue on one side and RAL 670-3 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 Reef Blue comparisons
See how Reef Blue stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 45, White Dove is decisively the brighter choice.
Purbeck Stone reads slightly lighter (LRV 52 vs 45), a gap that shows most in low-lit rooms.
Reef Blue reflects far more light (LRV 45 vs 30), opening up a space where Evergreen Fog encloses it.
Agreeable Gray reflects far more light (LRV 60 vs 45), opening up a space where Reef Blue encloses it.
At LRV 58 vs 45, Accessible Beige is decisively the brighter choice.
At LRV 45 vs 27, Reef Blue is decisively the brighter choice.
With LRVs of 45 and 43, the two reflect almost the same amount of light.
A 10-point LRV gap (55 vs 45) makes Tranquil Dawn the marginally brighter of the two.
Their light reflectance is nearly identical (LRV 45 vs 44), so neither reads brighter in a room.
Pure White reflects far more light (LRV 84 vs 45), opening up a space where Reef Blue encloses it.
At LRV 66 vs 45, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 45, Shoji White is decisively the brighter choice.
At LRV 45 vs 12, Reef Blue is decisively the brighter choice.
At LRV 68 vs 45, Skimming Stone is decisively the brighter choice.
At LRV 45 vs 12, Reef Blue is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 45 vs 45), so neither reads brighter in a room.
Reef Blue reflects far more light (LRV 45 vs 31), opening up a space where Pale Green encloses it.
Reef Blue reflects far more light (LRV 45 vs 7), opening up a space where Pine Needle encloses it.
Reef Blue reflects far more light (LRV 45 vs 24), opening up a space where Cement grey encloses it.
Guilford Green reflects far more light (LRV 57 vs 45), opening up a space where Reef Blue encloses it.