Code M520-2 (After Rain) reflects 68% of incident D65 light. Measured in CAM16-UCS uniform space, Behr After Rain (M520-2) registers J'=87.7, a'=-8.54, and b'=-10.58 with HSL (202°, 49%, 84%) and Helmholtz-Kohlrausch perceived value 87.2 L*_HK. Because M520-2 carries a*=-5.52 red-green and b*=-10.24 yellow-blue balance at chroma C*=11.63, After Rain projects a cool cool coastal blue-grey character across drywall and millwork.
Thermal lighting shifts Behr M520-2 predictably. Under 5000K noon daylight, After Rain (M520-2) holds its native #C9DAE1 swatch; at 4000K cool office LED, M520-2 adapts to #D1D8D7; at 3500K halogen, After Rain transitions to #D7D7D1; at 3000K residential LED, M520-2 warms to #DDD5CB; and under 2700K evening bulbs, After Rain (M520-2) settles at #E2D4C7.
When cross-matching Behr After Rain (M520-2, #C1DBEA), Benjamin Moore Soft Sky (807, #C1D7E4, LRV 65.28%) scores ΔE2000=1.43 and CAM16=1.74, followed by Jet Stream (814, ΔE=1.77). In Sherwin-Williams, Soar (SW 6799, #C3DFE8, LRV 69.93%) achieves ΔE2000=3.08 ahead of Rhythmic Blue (SW 6806, ΔE=3.51). Coordinate M520-2 with Ultra Pure White 1850 (1850) ceilings, Vibrant White (BWC-12) trim, Igloo (760E-1) hallways, and Windsurf (PPU14-9) accents.