Code M540-2 (Angelic Blue) reflects 69% of incident D65 light. Measured in CAM16-UCS uniform space, Behr Angelic Blue (M540-2) registers J'=88.2, a'=-2.89, and b'=-10.07 with HSL (216°, 38%, 86%) and Helmholtz-Kohlrausch perceived value 87.3 L*_HK. Because M540-2 carries a*=-0.59 red-green and b*=-9.1 yellow-blue balance at chroma C*=9.12, Angelic Blue projects a cool cool violet-grey character across drywall and millwork.
Thermal lighting shifts Behr M540-2 predictably. Under 5000K noon daylight, Angelic Blue (M540-2) holds its native #D6D8E0 swatch; at 4000K cool office LED, M540-2 adapts to #DDD6D6; at 3500K halogen, Angelic Blue transitions to #E3D5D0; at 3000K residential LED, M540-2 warms to #E9D3CA; and under 2700K evening bulbs, Angelic Blue (M540-2) settles at #EED2C7.
When cross-matching Behr Angelic Blue (M540-2, #CED9E9), Benjamin Moore Misty Blue (820, #C7D5E4, LRV 65.11%) scores ΔE2000=1.86 and CAM16=2.09, followed by Ice Sculpture (CC-938, ΔE=1.86). In Sherwin-Williams, Breathtaking (SW 6814, #C7D1E2, LRV 63.03%) achieves ΔE2000=1.97 ahead of Wishful Blue (SW 6813, ΔE=3.39). Coordinate M540-2 with YL-W15 (YL-W15) ceilings, Maui Mist (BL-W10) trim, Igloo (760E-1) hallways, and Blue Willow (570F-4) accents.