Vast Sky (SW 6506)
Illustrative room. Screen colors vary; test a sample before you paint.
Vast Sky (SW 6506) is a medium, cool blue from Sherwin-Williams: LRV 55, so it reflects about 55 percent of the light that hits it.
Colors that go with Vast Sky
Four Sherwin-Williams colors picked for Vast Sky by this site's color math: a trim white, a deeper blue, a quiet contrast from another family, a dark accent. Sherwin-Williams did not choose these pairings.
Closest match in every other brand
Each brand's closest color to Vast Sky, ranked by CIEDE2000 (deltaE): under 1.0 is indistinguishable, 1.0 to 2.3 very close, 2.3 to 5 noticeably different, over 5 clearly different.
| Brand | Closest color | Code | LRV | deltaE | How close |
|---|---|---|---|---|---|
| Benjamin Moore | Greenhow Blue | CW-655 | 55.5 | 1.4 | very close |
| Behr | Early September | M500-2 | 57.7 | 1.1 | very close |
| Valspar | Northern Sky Blue | 4008-5B | 53 | 1.7 | very close |
| PPG Paints | Sonata | 1157-3 | 55 | 1.5 | very close |
Lighter and darker in Sherwin-Williams
The Sherwin-Williams blue colors nearest to Vast Sky (LRV 55) by LRV.
Lighter than Vast Sky
Darker than Vast Sky
Color data
| Brand | Sherwin-Williams |
|---|---|
| Color code | SW 6506 |
| Hex | #A9C9D7 |
| RGB | 169, 201, 215 |
| HSL | 198°, 37%, 75% |
| LRV (light reflectance value) | 55 |
| Lab L*, a*, b* | 79.1, -7.6, -10.5 |
| Undertone | Cool Blue |
| Temperature | cool |
| Color family | Blue |
Same paint, two kinds of light
Vast Sky (SW 6506), published as #A9C9D7
#95BFD5
#BDD3D7
These swatches and the rooms above are a simulation, not a measurement. How the visualizer works
Similar shades from Sherwin-Williams
More from Sherwin-Williams
Common questions
- What is the LRV of Vast Sky (SW 6506)?
- Vast Sky has an LRV of 55. LRV runs from 0 (black) to 100 (pure white) and measures the share of light a surface reflects, so Vast Sky is a medium color.
- What is the closest match to Vast Sky in another brand?
- Early September (Behr M500-2) from Behr, at a deltaE of 1.1 (very close).
- Is Vast Sky warm or cool?
- Sherwin-Williams lists Vast Sky as cool, with a Cool Blue undertone. Its Lab b* value is -10.5; a higher b* is warmer and yellower, a lower one cooler and bluer.
Sources: LRV and hex as published by the manufacturer, via PaintDB (CC BY 4.0). Color differences are CIEDE2000 values computed by this site from the hex values (data snapshot 2026-10-01). Color names and codes belong to their manufacturers.