Comparison

Louisburg Green vs Green Onyx

Benjamin Moore HC-113 and Sherwin-Williams SW 9128, ΔE 1.66 apart

Benjamin Moore Louisburg Green HC-113 on a wall, hex #9C9E87
Louisburg Green Benjamin Moore HC-113
Sherwin-Williams Green Onyx SW 9128 on a wall, hex #989A82
Green Onyx Sherwin-Williams SW 9128
Zeytin’s verdict · ΔE 1.66Twins, almost. Only daylight on a big wall tells them apart.

Benjamin Moore Louisburg Green (HC-113) and Sherwin-Williams Green Onyx (SW 9128) measure a delta-E of 1.66 apart. Louisburg Green is 2.4 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 12.8 and 13.4. The difference is measurable but subtle. It shows on a large wall in strong daylight and disappears under lamplight. If you need the Green Onyx depth in Benjamin Moore's line, start from its LRV of 31.4 rather than matching by name.

Is Benjamin Moore Louisburg Green the same color as Sherwin-Williams Green Onyx?

Not quite, but close - Benjamin Moore Louisburg Green and Sherwin-Williams Green Onyx are delta-E 1.66 apart, close enough that most rooms would not show the difference.

What is the delta-E between Benjamin Moore Louisburg Green and Sherwin-Williams Green Onyx?

The measured color distance between Benjamin Moore Louisburg Green and Sherwin-Williams Green Onyx is delta-E 1.66.

Which is lighter, Benjamin Moore Louisburg Green or Sherwin-Williams Green Onyx?

Benjamin Moore Louisburg Green is lighter than Sherwin-Williams Green Onyx by 2.4 points of light reflectance (LRV).

CLOSEST PAIRΔE 1.66 Louisburg Green and Green Onyx
LIGHTESTLouisburg Green LRV 33.8
DARKESTGreen Onyx LRV 31.4
SPREAD2.4LRV points

Side by side

measured values
Louisburg Green Green Onyx
Brand Benjamin Moore Sherwin-Williams
Code HC-113 SW 9128
Hex #9C9E87 #989A82
Light reflectance 33.8 31.4
Undertone yellow-green undertone yellow-green undertone
Chroma 12.8 13.4
Hue angle 112.4° 112.2°
Color family yellow yellow

Each on its own

full detail