1. Introduction and Overview
This manual provides detailed instructions for the installation, operation, maintenance, and troubleshooting of the Lithonia Lighting 2BLT4 46L ADP LP840 Low-Profile Recessed LED Luminaire. This luminaire features a center basket design, offering a clean and versatile style with volumetric light distribution. Its high-efficacy LED light engines are designed for energy efficiency and reduced maintenance compared to traditional lighting sources. The low-profile design (2-3/8 inches) makes it suitable for various applications, including schools, offices, commercial spaces, retail, hospitals, healthcare facilities, and renovation projects.
Image 1.1: Lithonia Lighting 2BLT4 46L ADP LP840 Low-Profile Recessed LED Luminaire. This image shows the overall appearance of the 2x4 foot LED luminaire.
Image 1.2: BLT Series Configurable Best-in-Value Low-Profile LED Luminaire. This image highlights the product series and its configurable nature.
2. Safety Information
WARNING: To reduce the risk of death, personal injury, or property damage from fire, electric shock, falling parts, cuts/abrasions, and other hazards, please read all warnings and instructions included with and on the fixture box and all fixture labels. Installation and servicing must be performed by a qualified electrician. This product must be installed in accordance with the applicable installation code by a person familiar with the construction and operation of the product and the hazards involved.
- Disconnect power before installation or servicing.
- Ensure the luminaire is properly grounded.
- Do not handle energized fixtures when hands are wet, when standing on wet or damp surfaces, or in water.
- This luminaire is CSA certified to meet U.S. and Canadian standards and is IC rated.
- Suitable for damp locations.
3. Product Features
- Construction: Enclosure components are die-formed for dimensional consistency and painted with a polyester powder paint for improved performance and protection.
- Light Output: Delivers 4600 lumens with a cool white color temperature (4000K).
- LED Lifespan: Long-life LEDs, coupled with high-efficiency drivers, provide superior quantity and quality of illumination for 60,000 hours. Color Rendering Index (CRI): 82.
- Installation Compatibility: Fits into standard 15/16 inch and narrow 9/16 inch T-grid ceiling systems.
- Environmental Rating: Suitable for damp locations.
- Certifications: CSA certified to meet U.S. and Canadian standards, IC rated.
- Low Profile Design: The luminaire features a low profile of 2-3/8 inches.
- Volumetric Distribution: Offers a clean, versatile style and volumetric light distribution.
Color Temperature Illustration
Image 3.1: This image illustrates different color temperatures. The 2BLT4 46L ADP LP840 provides 4000K Cool White light, as shown on the right side of the image.
4. Setup and Installation
Installation of the 2BLT4 46L ADP LP840 luminaire should be performed by a qualified electrician in accordance with local electrical codes. The fixture is designed for ceiling mount installation within standard 15/16 inch and narrow 9/16 inch T-grid ceiling systems.
Mounting Instructions
- Ensure the ceiling grid is properly installed and capable of supporting the luminaire's weight (approximately 17 pounds).
- The luminaire is designed to fit into a 2x4 foot opening in the T-grid ceiling.
- Connect the electrical wiring to the luminaire's junction box, ensuring all connections are secure and comply with local codes.
- The fixture is non-removable once installed.
Image 4.1: This image displays the 2BLT Volumetric Recessed Lighting 2'x4' unit, detailing various sensor options and providing a visual representation of the basic nLight zone and nLight WallPod. It also includes diagrams for mounting data, showing how the luminaire integrates with exposed and concealed T-grid ceiling systems.
Refer to the 'Mounting Data' section in Image 4.1 for detailed diagrams on how the luminaire integrates with exposed T-grid, concealed T-grid, and plaster or plasterboard ceiling systems. Ensure appropriate trim types are used for each mounting configuration.
5. Operating Instructions
The Lithonia Lighting 2BLT4 46L ADP LP840 luminaire is designed for straightforward operation. It can be controlled via an app, and certain configurations may include integrated sensors or nLight wired networking for advanced control.
Sensor Options and Control Methods
The luminaire may be equipped with various sensor options for enhanced control and energy efficiency:
- Automatic Dimming Photocell (ADP): Automatically adjusts light output based on ambient light levels.
- Occupancy Sensing: Detects presence in a room to turn lights on/off or dim.
- PDT (Passive Infrared / Microphonics Dual Tech): Combines PIR and acoustic sensing for improved occupancy detection.
- nLight Wired Networking: Allows for networked control of luminaires, enabling advanced lighting control strategies across multiple fixtures and zones.
Refer to Image 4.1 for a visual representation of the 'Sequence of Operation' for both integrated sensors with individual control and nLight wired networking. These diagrams illustrate how light levels respond to motion detection and ambient light conditions.
App Control
If your luminaire is configured for app control, please refer to the specific app's instructions for pairing and operation. This typically involves downloading a dedicated app and following the on-screen prompts to connect and manage your lighting.
6. Maintenance
The Lithonia Lighting 2BLT4 46L ADP LP840 LED luminaire is designed for low maintenance due to its long-life LEDs (rated for 60,000 hours). Regular maintenance is minimal but important for optimal performance and longevity.
- Cleaning: Periodically clean the exterior surfaces of the luminaire with a soft, dry, or slightly damp cloth. Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish or optical components.
- Inspection: Annually inspect the luminaire for any visible damage, loose connections, or signs of wear. Ensure all mounting hardware remains secure.
- LEDs: The LEDs are integrated and not user-serviceable. Do not attempt to replace individual LEDs.
7. Troubleshooting
If the luminaire is not functioning as expected, refer to the following troubleshooting guide. For issues not resolved by these steps, contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Luminaire does not turn on | No power supply; Loose wiring connection; Faulty switch/control; Sensor malfunction | Check circuit breaker and power source; Verify all wiring connections are secure; Test switch/control unit; Check sensor settings and ensure no obstructions. |
| Light output is dim or flickers | Incorrect dimmer compatibility; Wiring issue; Sensor interference | Ensure compatible dimmer is used (if applicable); Inspect wiring for loose connections; Check for objects blocking sensors or excessive ambient light affecting photocell. |
| Luminaire turns on/off unexpectedly | Sensor misconfiguration; Environmental interference | Review sensor settings (occupancy/photocell); Ensure sensors are not triggered by HVAC, moving objects, or sudden light changes. |
| Multiple fixtures fail within a short period | Power supply instability; Installation error; Product defect | Consult a qualified electrician to inspect the electrical system and installation. If issues persist, contact customer support. |
8. Specifications
The following table outlines the key specifications for the Lithonia Lighting 2BLT4 46L ADP LP840 LED Luminaire:
| Specification | Detail |
|---|---|
| Model Number | 2BLT4 46L ADP LP840 |
| Dimensions (L x W x H) | 47.75" x 23.75" x 2.38" |
| Item Weight | 17 Pounds |
| Brightness | 4600 Lumens |
| Color Temperature | 4000K (Cool White) |
| Wattage | 39 watts |
| Voltage | 120 Volts |
| CRI (Color Rendering Index) | 82 |
| Light Source | LED |
| Control Method | App (and optional integrated sensors/nLight) |
| Material | Alloy Steel (fixture), Polyester (shade) |
| Finish Type | Powder Coated |
| Mounting Type | Ceiling Mount (Recessed) |
| Certifications | CSA, IC Rated |
| UPC | 889804541533 |
Image 8.1: This image provides detailed photometric data for the 2BLT series, including candela power distribution and zonal lumen summaries. It also illustrates the concept of Constant Lumen Management versus Without Lumen Management, highlighting energy savings and consistent light output over time. Performance data for various lumen packages is also presented.
9. Warranty and Support
The Lithonia Lighting 2BLT4 46L ADP LP840 LED Luminaire comes with a 5-year limited warranty. This warranty covers defects in materials and workmanship under normal use and service.
For complete warranty terms and conditions, please visit the official Acuity Brands website or refer to the documentation provided with your purchase. Keep your proof of purchase for warranty claims.
Customer Support
If you require technical assistance, have questions about installation, operation, or need to make a warranty claim, please contact Lithonia Lighting customer support:
- Website: Visit the Acuity Brands Customer Care page for support resources and contact information.
- Phone: Refer to the product packaging or the Acuity Brands website for the most current customer service contact numbers.
When contacting support, please have your product model number (2BLT4 46L ADP LP840) and proof of purchase readily available.
