What 34 tells you about Debonair
The published LRV of Sherwin-Williams Debonair SW-9139 is 34. It describes light reflectance; it does not specify an undertone or predict the brightness of your room. Debonair occupies a middle ground between pale slate blues and near-black navies.
The choice beside cream walls and brushed brass
Cream walls allow blue millwork to become the architectural color, with brass used as a smaller highlight rather than the main contrast.
Compare Debonair and Stardew at equal size, first considering depth and then hue. A lighter blue, green or pink is still a colored surface. Use the LRV to organize the depth question without assuming that it measures saturation or predicts which hue the room will favor.
What the comparison can—and cannot—settle
Debonair has an LRV of 34; Sherwin-Williams Stardew SW-9138 is 43. The difference is 9 points, with Stardew returning more light under the reference measurement. Debonair is a cool blue softened by slate gray. The value measures reflectance, so it cannot by itself identify an undertone, a coating finish or the amount of illumination needed in the room. The daylight and evening-light checks covers that related choice.
Review the blue on a vertical panel from across the room; use its medium depth to separate the millwork. Do not read LRV 34 as a percentage improvement in perceived room brightness. Make the decision with the board upright at the actual wall or cabinet position, including the least illuminated portion. The north-facing room assessment covers that related choice. Before ordering samples, compare room-planning features in the paint color visualizer roundup.
Sources & notes
Color specifications: Sherwin-Williams Debonair SW-9139. The recorded LRV is 34. Named comparison values come from the respective manufacturers; material schemes are editorial suggestions.
This guide reviews published color information and proposes practical sample checks. It does not claim first-hand paint testing or customer-review scores. Sherwin-Williams does not sponsor or endorse this site. Product names and trademarks belong to their respective owners. Confirm the color in a physical sample and select the coating for the actual surface and finish.