Code 2128-60 (Beacon Gray) reflects 66.73% of incident D65 light. Measured in CAM16-UCS uniform space, Benjamin Moore Beacon Gray (2128-60) registers J'=87.3, a'=-4.38, and b'=-5.88 with HSL (205°, 20%, 84%) and Helmholtz-Kohlrausch perceived value 86 L*_HK. Because 2128-60 carries a*=-2.03 red-green and b*=-4.61 yellow-blue balance at chroma C*=5.04, Beacon Gray projects a cool cool coastal blue-grey character across drywall and millwork.
Thermal lighting shifts Benjamin Moore 2128-60 predictably. Under 5000K noon daylight, Beacon Gray (2128-60) holds its native #D5D6D5 swatch; at 4000K cool office LED, 2128-60 adapts to #DCD4CC; at 3500K halogen, Beacon Gray transitions to #E1D3C6; at 3000K residential LED, 2128-60 warms to #E8D1C1; and under 2700K evening bulbs, Beacon Gray (2128-60) settles at #ECD0BD.
When cross-matching Benjamin Moore Beacon Gray (2128-60, #CDD7DE), Behr Pale Cornflower (S520-1, #CED9E1, LRV 68%) scores ΔE2000=0.66 and CAM16=0.85, followed by Siberian Ice (MQ3-57, ΔE=1.1). In Sherwin-Williams, Mild Blue (SW 6533, #CBD5DB, LRV 65.28%) achieves ΔE2000=0.7 ahead of Icelandic (SW 6526, ΔE=1.24). Coordinate 2128-60 with Super White (I-02) ceilings, White (OC-151) trim, Celtic Blue (ES-31) hallways, and Pike'S Peak Gray (2127-50) accents.