Code HC-173 (Edgecomb Gray) reflects 65.48% of incident D65 light. Measured in CAM16-UCS uniform space, Benjamin Moore Edgecomb Gray (HC-173) registers J'=86.7, a'=-0.53, and b'=5.76 with HSL (43°, 22%, 81%) and Helmholtz-Kohlrausch perceived value 85.2 L*_HK. Because HC-173 carries a*=-0.51 red-green and b*=8.16 yellow-blue balance at chroma C*=8.18, Edgecomb Gray projects a warm warm yellow-cream character across drywall and millwork.
Thermal lighting shifts Benjamin Moore HC-173 predictably. Under 5000K noon daylight, Edgecomb Gray (HC-173) holds its native #E0D2BC swatch; at 4000K cool office LED, HC-173 adapts to #E7D0B3; at 3500K halogen, Edgecomb Gray transitions to #ECCFAE; at 3000K residential LED, HC-173 warms to #F2CDA9; and under 2700K evening bulbs, Edgecomb Gray (HC-173) settles at #F6CCA5.
When cross-matching Benjamin Moore Edgecomb Gray (HC-173, #D9D3C4), Behr Arid Landscape (N310-2, #DCD6C6, LRV 67%) scores ΔE2000=0.8 and CAM16=0.99, followed by Canvas Tan (UL170-14, ΔE=0.94). In Sherwin-Williams, Grecian Ivory (SW 7541, #D8CFBE, LRV 63.13%) achieves ΔE2000=1.66 ahead of Sedate Gray (SW 6169, ΔE=1.78). Coordinate HC-173 with Distant Gray (OC-68) ceilings, Ultra White (CC-10) trim, Woodland Snow (2161-70) hallways, and Crisp Linen (CSP-305) accents.