Code S560-1 (Courteous) reflects 66% of incident D65 light. Measured in CAM16-UCS uniform space, Behr Courteous (S560-1) registers J'=86.9, a'=0.62, and b'=-6.74 with HSL (235°, 15%, 85%) and Helmholtz-Kohlrausch perceived value 85.4 L*_HK. Because S560-1 carries a*=1.71 red-green and b*=-5.53 yellow-blue balance at chroma C*=5.79, Courteous projects a cool cool violet-grey character across drywall and millwork.
Thermal lighting shifts Behr S560-1 predictably. Under 5000K noon daylight, Courteous (S560-1) holds its native #DAD2D5 swatch; at 4000K cool office LED, S560-1 adapts to #E0D0CC; at 3500K halogen, Courteous transitions to #E6CFC6; at 3000K residential LED, S560-1 warms to #ECCDC1; and under 2700K evening bulbs, Courteous (S560-1) settles at #F0CCBD.
When cross-matching Behr Courteous (S560-1, #D2D3DE), Benjamin Moore Iced Lavender (1410, #D2D2DC, LRV 64.88%) scores ΔE2000=0.6 and CAM16=0.75, followed by Celestia Blue (1429, ΔE=1.99). In Sherwin-Williams, Elation (SW 6827, #DFDCE5, LRV 72.47%) achieves ΔE2000=2.96 ahead of Wishful Blue (SW 6813, ΔE=3.22). Coordinate S560-1 with Ultra Pure White® (PPU18-6) ceilings, Maui Mist (BL-W10) trim, Melodic White (PR-W3) hallways, and Bakery Box (BL-W9) accents.