2x4 50W Lithonia Lighting Stack LED Troffer

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What You Get Spec Value Why It Matters Light Output 6,000 lm / 50W / 124 lm/W Matches the output of a 2-lamp T8 fluorescent troffer at significantly lower wattage and longer servic e life Optic Type Volumetric center basket Illuminates walls and vertical surfaces alongside the floor below — not just straight down Profile Depth 1.9" Shallower than most 2x4 troffers — fits plenums where standard fixtures won't T-Grid Compatibility 15/16" and 9/16" Works in both standard and narrow T-grid systems without adapters Lamp Life L80: 60,000 hours Retains 80% brightness after 60,000 operating hours — longer than many troffers that degrade to 70% at 50,000 hours Certifications DLC Premium, IC, CSA Qualifies for rebates; safe for insulation contact; approved for damp locations A Troffer That Lights the Room, Not Just the Desk Built on Lithonia Lighting's STACK platform, this troffer takes a different approach to commercial illumination than a standard lay-in troffer. Its volumetric center basket optic spreads light across walls, partitions, and vertical surfaces rather than concentrating it downward which creates a more balanced, comfortable environment for the people working or moving through the space. Volumetric Illumination, Not Just Task Lighting: Standard troffers direct most light downward, leaving walls and vertical surfaces relatively dim and creating a flat quality of light. The STACK's center basket optic is purpose-designed to redirect a portion of light outward toward walls and partitions, creating balanced illumination that renders the space and its occupants more naturally. 1.9" Depth for Tight Plenums: At only 1.9" deep, this troffer installs comfortably in plenum spaces that standard-depth troffers can't fit — no modifications to the ceiling grid, no special hardware. Fits Both T-Grid Types: Compatible with standard 15/16" and narrow 9/16" T-bar ceiling systems, with easy-to-position attachment clips included — no adapter required for either system. IC-Rated for Insulation Contact: Rated for direct contact with ceiling insulation, making it suitable for top-floor installations and spaces where insulation is present directly above the plenum. Damp Location Listed: Approved for use in restrooms, locker rooms, and other damp locations — broader application range than a standard office troffer. 0-10V Dimmable: Dims from 100% down to 10% for compatibility with standard dimming controls and daylight harvesting systems. DLC Premium Listed: Qualifies for the highest tier of utility rebates. Buy from ELEDLights to get full rebate support. Ideal Applications Offices & Open-Plan Workspaces: Volumetric illumination reduces the flat, washed-out quality of standard downlight-only troffers, creating a more comfortable visual environment for extended desk work. Schools & Classrooms: Balanced light on walls and vertical surfaces reduces eye strain for students facing whiteboards and wall-mounted displays so they can focus on learning without distractions. Healthcare Facilities: Damp location listing and balanced illumination suit exam rooms, corridors, and patient areas where light quality and hygiene compliance both matter. Retail & Commercial Spaces: Wall illumination helps merchandise and signage read clearly without requiring separate accent lighting. Tight Plenum Installations: 1.9" depth fits in restrictive plenum applications where standard troffers may not — particularly useful in renovation and retrofit projects where ceiling depth is constrained. Damp Locations: Restrooms, locker rooms, and break rooms where a damp-rated fixture is required but a specialty fixture isn't necessary. How It Compares The STACK is purpose-designed for volumetric light distribution — here's what that means in practice compared to a standard 2x4 troffer. Lithonia STACK Standard 2x4 Troffer Light Distribution Illuminates walls and vertical surfaces in addition to the floor — balanced, three-dimensional light Concentrates output primarily downward — walls and vertical surfaces receive less light Profile Depth 1.9" — fits restrictive plenums Typically 2.5+" — may not fit in tight plenum applications T-Grid Compatibility 15/16" and 9/16" — no adapter needed Often 15/16" only, or requires adapter for 9/16" IC Rating Yes — safe for insulation contact Not always — check before installing above insulation Damp Location Listed — suits restrooms and locker rooms Often dry location only Certification DLC Premium Often DLC Standard or unlisted — fewer rebate opportunities When light quality, installation flexibility, and broad application range matter, the STACK is the right choice. ELEDLights Stands Behind It DLC Premium listed — qualifies for most utility rebate programs US-based support Monday–Friday, 8am–8pm EST — call, text, or email a real person In stock, ships fast straight from our U.S. warehouses LIthonia SKU: STAK 2X4 6000LM 80CRI 40K COL MIN10 ZT MVOLT Show more