Lithonia Lighting 2BLT4R Volumetric Recessed Lighting 2'x4' Relight

Overview

The Lithonia Lighting 2BLT4R is a 2'x4' LED relight troffer designed to efficiently retrofit existing fluorescent lensed or parabolic troffers. It offers a reliable, long-lasting performance upgrade, bypassing old fluorescent components and providing a platform for modern networked controls. The unit is UL rated for air-handling troffer housings and features high reflectivity matte white powder coating.

Features & Specifications

Intended Use

Designed to retrofit nearly any 2'x4' fluorescent lensed or parabolic troffer. Standard kit for T-grid mounted recessed units, with optional brackets for drywall or surface mounting. UL rated for air-handling troffer housings.

Construction

Universal end brackets (painted steel) fit most 2'x4' troffers. Unitized doorframe, reflector, and electrical chassis require no field assembly. High reflectivity matte white powder coating. Diffuser trim rings provide mounting for controls/sensors. All components accessible from below the ceiling plane.

Optics

Volumetric illumination for balanced luminous environments. High-performance extruded acrylic diffusers conceal LEDs. Available diffuser designs: curved/square with linear prisms, or smooth frosted. Optional lower glare, very low UGR lens available.

Electrical

Long-life LEDs with high-efficiency drivers. Greater than 80% LED lumen maintenance at 60,000 hours (L80+ > 60,000). Calculated L70 lumen maintenance > 150,000 hours. Color variation within 3-step MacAdam ellipse (35DCM).

Dimming & Control Options

Base (non-configurable): Generic 0-10V dimming driver (dims to 10%).

Configurable BLTR: Offers >135 LPW across various lumen outputs, CCTs, and driver options. Includes eldoLED driver options for dimming range, control, flicker-free operation, low inrush current, 89% efficiency, and low EMI.

Step-level dimming: Allows switching to 50% power for energy code compliance.

Optional Field Adjustable Output (FAOE, FAO): Mechanical adjustment for preferred high-end lumens. ⚙️

Integrated Sensors

SensorSwitch (Individual Control): MSD7ADCX (PIR) or MSDPDT7ADCX (PIR/Microphonics Dual Tech) occupancy sensor/automatic dimming photocell. Powers off when unoccupied or sufficient ambient light is present. ? See page 5 for details.

nLight Wired Networking: nLight-enabled sensors communicate over CAT-5 cabling to create control zones. Integrates with Gateway/Bridge for remote monitoring via SensorView software. ? See page 6 for options.

nLight Air Wireless Platform (rES7): Communicates wirelessly. Available with automatic dimming photocell and PIR or PDT occupancy sensor. Pairs via CLAIRITY™ mobile app for simple adjustment. ? See page 6 for details.

Integrated Wireless Sensor (Single Room): SensorSwitch SSAIR or SSAIR VAPIR luminaire-embedded occupancy/ambient light sensor. Powers off when unoccupied or sufficient ambient light is present. ? See page 4 for details.

Installation

Universal end brackets secured with TEKSTM screws. Integrated driver/light engine door assembly hinges for wiring. Doorframe closes and secures with cam latches. Suitable for damp locations (not available with sensor versions).

Listings

UL/cUL Listed for fluorescent luminaires. Classified for static and air-handling troffer housings. Tested to LM80 standards. DesignLights Consortium® (DLC) Premium and DLC qualified. Buy American Act (BAA) option available. Standard 2BLT4R meets TAA requirements. ? See www.acuitybrands.com/buy-american for details.

Warranty

5-year limited warranty. ? Complete warranty terms at: www.acuitybrands.com/support/warranty/terms-and-conditions

Specifications

Embed nLight Controls

Prepare for tomorrow with integrated nLight controls, offering scalability, space configuration, and future-ready capabilities. Features include user-friendly installation, enhanced energy savings, and code compliance.

Current Capabilities (Now)

• User-friendly install
• Enhanced energy savings
• Code compliance

Future Capabilities (Tomorrow)

• Scalability
• Space configuration
• Future-ready

Items marked with a shaded background qualify for the Design Select program and ship in 15 days or less. ? Visit www.acuitybrands.com/designselect for more information.

Ordering Information

Lead times vary by options. Consult your sales representative. Example: 2BLT4R 40L ADP EZ1 LP840

Key Ordering Parameters

nLight Interface & Controls

Notes: Refer to the PDF for detailed notes on options, compatibility, and special requirements (e.g., battery pack compatibility, voltage requirements for fuses, sensor option dependencies).

Fit & Compatibility

The 2BLT4R Relight Assembly is designed for upgrading recessed 2'x4' fixtures, including most parabolic and lensed troffers. Dimensional requirements are provided. Lithonia Lighting recommends trial installations for project quantities.

Bracket Types

Standard Bracket: For 15/16" and 9/16" T-grid, narrow screw-slot, and some hard ceiling installations.

"F" Bracket: For hard ceilings with "Lay-In" style plaster frames or integral drywall mounting. Does not have T-grid return flange, allowing use in obstructed or narrow grid ceilings.

LPB Bracket: One-piece low profile bracket for installations with obstructed housings.

Replacement / Trial Parts

Information on ordering replacement end brackets and flange bracket assemblies is available, with specific CI codes provided for 2x4, 2x2, and 1x4 sizes.

Differences between standard BLTR 2pc bracket and LPB 1-piece low profile bracket

The standard 2-piece bracket has an upper "T" bracket for mounting and bridging obstructions. The LPB 1-piece design was developed for specific older troffers with endplate obstructions.

Controls Integration

SensorSwitch™

SensorSwitch offers standalone wired and wireless lighting controls for room-based applications, providing reliable performance and ease of installation. Visit Sensorswitch.com.

Wired Embedded Controls

Installation Steps: 1. Install luminaires with embedded controls. 2. Install and wire the wall switch. 3. Connect load and 0-10V dimming wires from the wall switch to the luminaires.

Wireless Embedded Controls

Installation Steps: 1. Install luminaires with embedded controls. 2. Insert pairing tool into wall switch pinhole, press and hold button for 6 seconds. 3. Upon pairing, fixtures dim to 10% brightness.

nLight Platform

nLIGHT is a networked lighting controls platform for indoor and outdoor applications, offering wired or wireless options. It scales from room to campus-wide applications, supporting energy cost optimization, code compliance, and occupant comfort. nLIGHT interfaces with DALI®, BACnet®, DMX, and other devices. Visit nLIGHTcontrols.com.

nLight Embedded Fixture Features:

• Manual Dimming
• Motion Sensing and/or Daylight Harvesting
• Fixture or Group Level Control
• Flexibility
• Wireless Wall Switch (nLight AIR Only)
• Astronomical and Time of Day Scheduling
• Scalable Solution
• Future-Ready

nLight Customer Benefits:

• Convenience and visual comfort
• Energy savings and code compliance
• Configurable lighting to space requirements
• Ease of fixture moves, adds, and changes
• Ease and flexibility of placement
• Energy savings and building security
• Controls that grow with your business
• Platform for future upgrades

nLight Wired vs. Wireless

Wired: Uses CAT-5e cables for automatic device discovery and plug-and-play operation.

Wireless: Uses nLight AIR battery-powered wall switches. Pairing via CLAIRITY+ mobile app allows fixture customization.

Sensor Options

Sensor Coverage Pattern (Mini 360° Lens)

Recommended for walking motion detection from 8 ft (2.44 m) to 20 ft (6.10 m). Provides initial detection of walking motion along sensor axes up to 15 ft (4.57 m) at 2x mounting height, and up to 20 ft (6.10 m) at 1.75x. Offers 12 ft (3.66 m) radial detection of small motion at 9 ft (2.74 m) mounting height. Initial detection occurs earlier when walking across the sensor's field of view.

Embedded Controls Application Notes

MSD7ADCX (PIR): Ideal for areas without obstructions and where daylight harvesting is desired (hallways, corridors, storage, breakrooms).

MSDPDT7ADCX (PIR/Microphonics): Ideal for areas with obstructions and daylight harvesting (open offices, private offices, classrooms, restrooms, conference rooms).

nLight AIR with Wireless Sensor (rES7/rES7PDT): Suitable for retrofit/new construction where wiring is difficult. Sensors are part of the nLight AIR network, allowing grouping and control of multiple luminaires. Offers granular control with PIR/daylight sensing.

Wired Sensor (nES7/nESPDT7): nES7 is ideal for small rooms without obstructions or with primarily walking motion (hallways, corridors, storage, breakrooms). nES7ADCX includes photocell for daylight harvesting. nESPDT7 is recommended for areas with obstructions (restrooms, offices, conference rooms), utilizing PIR and Microphonics technologies. nESPDT7ADCX also includes photocell.

Sequence of Operation

MSD7 Sensor: Motion detected (Lights ON) -> Time Delay (e.g., 17.5 min) -> No Motion Detected (Lights OFF). Automatic dimming photocell preset to 5fc.

nES7/rES7 Sensor: Motion detected (Lights ON) -> Time Delay (e.g., 7.5 min) -> No Motion Detected (Lights OFF). Automatic dimming photocell preset to 5fc (nES7) or 10fc (rES7).

Emergency Battery Pack Options

Field-installable battery packs provide emergency lighting capabilities.

*Minimum delivered lumen output for product selection.

The CP10 delivered emergency illumination outperforms legacy 1400 lumen fluorescent emergency ballasts. Please contact productsupportemergency@acuitybrands.com for emergency battery questions.

UL924 Sequence of Operation (nLight AIR EM)

EM devices maintain high-end trim and ignore wireless commands unless a normal-power-sensed (NPS) broadcast is received every 8 seconds. Association with a group including a normal power sensing device via CLAIRITY+ app is required for NPS broadcasts. Compatible devices include rPP20, rLSXR, rSBOR, rSDGR, and nLight AIR luminaires with v3.4+ firmware.

BSE Labeling Options

BSE10: Driver load transfer relay installed per manufacturer instructions.

BSE14: One voltage fixture with driver load control relay and prewire (PWS option).

*RFA modification required for configurations with Reloc or two voltages.

Enabled with STAR (Self-Testing Automated Reporting)

STAR enables self-testing and automated reporting for life safety code compliance (NFPA 101). Test data logged in individual units (Mobile STAR) or via STAR Gateway (Connected STAR). Requirements include: 30-second tests every 30 days, 90-minute tests annually, and record keeping.

Photometrics

2BLT4R 40L ADP LP835: Input Watts: 31.0, Delivered Lumens: 3960, LPW: 127.7, S/MH: 1.19, Test No: ISF 36900P313

Zonal Lumen Summary

Coefficients of Utilization (CU)

Table showing CU values for different room conditions (e.g., 80% / 50% / 20% reflectance).

Cone of Light

Diagram illustrating light distribution. Beam Angle: 104.6°, Field Angle: 172.1°.

2BLT4R 48L ADP LP835: Input Watts: 31.0, Delivered Lumens: 4910, LPW: 130.6, S/MH: 1.19, Test No: ISF 36900P233

Zonal Lumen Summary

Coefficients of Utilization (CU)

Table showing CU values for different room conditions.

Cone of Light

Diagram illustrating light distribution. Beam Angle: 104.6°, Field Angle: 172.1°.

Accessories & Replacement Parts

Replacement parts, such as lens assemblies and disconnect plugs, can be ordered separately using specific catalog numbers.

Example Replacement Parts:

• 2DBLTR48 ADP LENS ASSEMBLY: 2'x4' replacement lens (trims included)
• RK8BDP 2P U: Disconnect Plug (BDP), 2 Pole, Package of 1