Code HC-166 (Kendall Charcoal) reflects 13.28% of incident D65 light. Measured in CAM16-UCS uniform space, Benjamin Moore Kendall Charcoal (HC-166) registers J'=45.7, a'=-0.72, and b'=2.03 with HSL (48°, 2%, 39%) and Helmholtz-Kohlrausch perceived value 43.3 L*_HK. Because HC-166 carries a*=-0.42 red-green and b*=2.4 yellow-blue balance at chroma C*=2.44, Kendall Charcoal projects a warm warm yellow-cream character across drywall and millwork.
Thermal lighting shifts Benjamin Moore HC-166 predictably. Under 5000K noon daylight, Kendall Charcoal (HC-166) holds its native #6B655E swatch; at 4000K cool office LED, HC-166 adapts to #6E6559; at 3500K halogen, Kendall Charcoal transitions to #716456; at 3000K residential LED, HC-166 warms to #746354; and under 2700K evening bulbs, Kendall Charcoal (HC-166) settles at #766252.
When cross-matching Benjamin Moore Kendall Charcoal (HC-166, #676662), Behr Chinchilla (PPU24-03, #6A6661, LRV 13%) scores ΔE2000=1.72 and CAM16=1.39, followed by Mined Coal (PPU18-18, ΔE=2.15). In Sherwin-Williams, Grizzle Gray (SW 7068, #636562, LRV 12.85%) achieves ΔE2000=1.79 ahead of Night Owl (SW 7061, ΔE=2.35). Coordinate HC-166 with Chantilly Lace (OC-65) ceilings, Chalk White (2126-70) trim, Storm (AF-700) hallways, and Whisper (CSP-500) accents.