Code SW 6589 (Alyssum) reflects 71.58% of incident D65 light. Measured in CAM16-UCS uniform space, Sherwin-Williams Alyssum (SW 6589) registers J'=89.8, a'=9.03, and b'=1.90 with HSL (356°, 53%, 89%) and Helmholtz-Kohlrausch perceived value 88.8 L*_HK. Because SW 6589 carries a*=10.38 red-green and b*=2.72 yellow-blue balance at chroma C*=10.73, Alyssum projects a warm warm pink-beige character across drywall and millwork.
Thermal lighting shifts Sherwin-Williams SW 6589 predictably. Under 5000K noon daylight, Alyssum (SW 6589) holds its native #F9D4CE swatch; at 4000K cool office LED, SW 6589 adapts to #FFD2C5; at 3500K halogen, Alyssum transitions to #FFD1BF; at 3000K residential LED, SW 6589 warms to #FFCFBA; and under 2700K evening bulbs, Alyssum (SW 6589) settles at #FFCEB6.
When cross-matching Sherwin-Williams Alyssum (SW 6589, #F2D5D7), Behr Lotus Petal (M150-1, #F3D6D7, LRV 72%) scores ΔE2000=0.47 and CAM16=0.48, followed by Summer Crush (P140-1, ΔE=0.9). In Benjamin Moore, Pink Dynasty (1352, #F3D6DA, LRV 72.4%) achieves ΔE2000=0.88 ahead of Powder Blush (1338, ΔE=1.23). Coordinate SW 6589 with High Reflective White (SW 7757) ceilings, Ibis White (SW 7000) trim, Delightful (SW 6289) hallways, and Orchid (SW 71) accents.