Comparison

November Skies vs Overcast Sky

Benjamin Moore 2128-50 and Dunn-Edwards DE5821, ΔE 1.84 apart

Benjamin Moore November Skies 2128-50 on a wall, hex #ACBAC8
November Skies Benjamin Moore 2128-50
Dunn-Edwards Overcast Sky DE5821 on a wall, hex #A7B8C4
Overcast Sky Dunn-Edwards DE5821
Zeytin’s verdict · ΔE 1.84Twins, almost. Only daylight on a big wall tells them apart.

Benjamin Moore November Skies (2128-50) and Dunn-Edwards Overcast Sky (DE5821) measure a delta-E of 1.84 apart. November Skies is 2.1 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 8.9 and 8.7. The difference is measurable but subtle. It shows on a large wall in strong daylight and disappears under lamplight. If you need the Overcast Sky depth in Benjamin Moore's line, start from its LRV of 46.5 rather than matching by name.

Is Benjamin Moore November Skies the same color as Dunn-Edwards Overcast Sky?

Not quite, but close - Benjamin Moore November Skies and Dunn-Edwards Overcast Sky are delta-E 1.84 apart, close enough that most rooms would not show the difference.

What is the delta-E between Benjamin Moore November Skies and Dunn-Edwards Overcast Sky?

The measured color distance between Benjamin Moore November Skies and Dunn-Edwards Overcast Sky is delta-E 1.84.

Which is lighter, Benjamin Moore November Skies or Dunn-Edwards Overcast Sky?

Benjamin Moore November Skies is lighter than Dunn-Edwards Overcast Sky by 2.1 points of light reflectance (LRV).

CLOSEST PAIRΔE 1.84 November Skies and Overcast Sky
LIGHTESTNovember Skies LRV 48.6
DARKESTOvercast Sky LRV 46.5
SPREAD2.1LRV points

Side by side

measured values
November Skies Overcast Sky
Brand Benjamin Moore Dunn-Edwards
Code 2128-50 DE5821
Hex #ACBAC8 #A7B8C4
Light reflectance 48.6 46.5
Undertone blue undertone blue undertone
Chroma 8.9 8.7
Hue angle 257.3° 247.4°
Color family blue teal

Each on its own

full detail