Benjamin Moore Dusky Blue (1640) records 61.02% LRV and 83.2 L*_HK lightness (#BDD1D4, RGB 189/209/212). Its CIELAB coordinates (L*=82.47, a*=-6.11, b*=-3.78, C*=7.18, h°=211.7°) place 1640 in the Cool Coastal Blue-Grey class. Top cross-brand matches for Dusky Blue (1640) are Behr Cloudy Day (540E-2, ΔE=1.16) and Sherwin-Williams Little Boy Blu (SW 9054, ΔE=2.12).
Benjamin Moore Dusky Blue (1640, #BDD1D4) is compared against competitor swatches under ISO/CIE 11664-6 (ΔE2000) and ASTM E308.
| Role / Brand | Paint Color Name & Code | HEX Code | LRV % | Undertone Profile | CIE ΔE 2000 |
|---|---|---|---|---|---|
| SOURCE (Benjamin Moore) | Dusky Blue (1640) | #BDD1D4 | 61.02% | Cool Coastal Blue-Grey | 0.00 (Ref) |
| Behr #1 | Cloudy Day (540E-2) | #BCCED2 | 59% | Cool Coastal Blue-Grey | ΔE 1.16 (97.6%) |
| Behr #2 | Wind Speed (S450-2) | #BFD6D9 | 64% | Cool Coastal Blue-Grey | ΔE 1.45 (97%) |
| Sherwin-Williams #1 | Little Boy Blu (SW 9054) | #C7D8DB | 66.23% | Cool Coastal Blue-Grey | ΔE 2.12 (95.5%) |
| Sherwin-Williams #2 | Sleepy Blue (SW 6225) | #BCCBCE | 57.74% | Cool Coastal Blue-Grey | ΔE 2.18 (95.4%) |
Cross-room ΔE=1.16 equivalent for 1640: Cloudy Day (540E-2) delivers -2 LRV points deeper than Dusky Blue (1640) with -0.53 softer C*=6.65 chroma.
Cross-room ΔE=1.45 equivalent for 1640: Wind Speed (S450-2) delivers +3 LRV points lighter than Dusky Blue (1640) with +0.97 higher C*=8.15 chroma.
Cross-room ΔE=1.56 equivalent for 1640: Cloudy Sky (S470-1) delivers +3 LRV points lighter than Dusky Blue (1640) with matched C*=7.1 saturation.
Visual ΔE=2.12 alternative to 1640: Little Boy Blu (SW 9054) delivers +5.2 LRV points lighter than Dusky Blue (1640) with -1.03 softer C*=6.15 chroma.
Visual ΔE=2.18 alternative to 1640: Sleepy Blue (SW 6225) delivers -3.3 LRV points deeper than Dusky Blue (1640) with -1.64 softer C*=5.54 chroma.
Visual ΔE=2.41 alternative to 1640: Balmy (SW 6512) delivers +5.1 LRV points lighter than Dusky Blue (1640) with matched C*=7.27 saturation.
Coordinated ceiling, trim, wall, sightline, and accent pairings for Dusky Blue (#BDD1D4, LRV 61.02%).
Dusky Blue (1640, h°=211.7°) tempers intense afternoon sunlight on Benjamin Moore walls.
Golden Teak, Pecan & Terracotta Pavers grounded by Dusky Blue
2700K–3000K Warm LED for 1640 (4000K renders #CCCEC2)
Need Dusky Blue (1640, LRV 61.02%) brighter or deeper? Adjacent Benjamin Moore fan-deck steps around #BDD1D4:
Calculate exact gallon volume for Benjamin Moore Dusky Blue (1640) accounting for standard North American door (21 sq.ft.) and window (15 sq.ft.) deductions.
Code 1640 (Dusky Blue) reflects 61.02% of incident D65 light. Measured in CAM16-UCS uniform space, Benjamin Moore Dusky Blue (1640) registers J'=84.5, a'=-8.78, and b'=-4.57 with HSL (188°, 21%, 79%) and Helmholtz-Kohlrausch perceived value 83.2 L*_HK. Because 1640 carries a*=-6.11 red-green and b*=-3.78 yellow-blue balance at chroma C*=7.18, Dusky Blue projects a cool cool coastal blue-grey character across drywall and millwork.
Thermal lighting shifts Benjamin Moore 1640 predictably. Under 5000K noon daylight, Dusky Blue (1640) holds its native #C5D0CB swatch; at 4000K cool office LED, 1640 adapts to #CCCEC2; at 3500K halogen, Dusky Blue transitions to #D1CDBD; at 3000K residential LED, 1640 warms to #D7CCB8; and under 2700K evening bulbs, Dusky Blue (1640) settles at #DCCAB4.
When cross-matching Benjamin Moore Dusky Blue (1640, #BDD1D4), Behr Cloudy Day (540E-2, #BCCED2, LRV 59%) scores ΔE2000=1.16 and CAM16=1.2, followed by Wind Speed (S450-2, ΔE=1.45). In Sherwin-Williams, Little Boy Blu (SW 9054, #C7D8DB, LRV 66.23%) achieves ΔE2000=2.12 ahead of Sleepy Blue (SW 6225, ΔE=2.18). Coordinate 1640 with Ice Mist (OC-67) ceilings, White (PM-2) trim, Icy Moon Drops (2056-70) hallways, and Snow White (2122-70) accents.
Spectrophotometric answers for homeowners, interior designers, and painting contractors specifying Benjamin Moore Dusky Blue.
Benjamin Moore Dusky Blue (1640) records an official Light Reflectance Value of 61.02% (#BDD1D4) and a Helmholtz-Kohlrausch perceived lightness of 83.2 L*_HK.
At 61.02% reflectance, Dusky Blue (1640) is a mid-tone Benjamin Moore shade with enough pigment depth (L*=82.47) to hold its #BDD1D4 color in bright sun.
CIELAB telemetry (L*=82.47, a*=-6.11, b*=-3.78) classifies Benjamin Moore Dusky Blue (1640) as a Cool Cool Coastal Blue-Grey with C*=7.18 chroma and h°=211.7° hue.
Pair Dusky Blue (1640) with South & West Sun Exposure for 1640 (61.02% LRV) and Golden Teak, Pecan & Terracotta Pavers grounded by Dusky Blue. Under 2700K evening bulbs, 1640 shifts from #BDD1D4 toward #DCCAB4.
Closest verified equivalents to Benjamin Moore Dusky Blue (1640, #BDD1D4) are Behr Cloudy Day (540E-2, #BCCED2) at ΔE2000=1.16 and Sherwin-Williams Little Boy Blu (SW 9054, #C7D8DB) at ΔE2000=2.12.
Both 540E-2 and SW 9054 matches are verified against Dusky Blue (1640) in CIE ΔE2000 and CAM16-UCS space.
Alongside Benjamin Moore Dusky Blue (1640, LRV 61.02%), our Ou-Luo harmony engine specifies Benjamin Moore White (PM-2, #EDEEEB, LRV 85.17%) in Semi-Gloss or Satin.
Pairing White (PM-2) with Dusky Blue (1640) frames door casings and baseboards cleanly.