1. Introduction
The TSL ROI-E420 Horticulture LED System is a high-performance lighting solution designed for commercial horticulture applications. This system integrates advanced LED technology to provide a balanced spectrum, utilizing Grower's Choice 3K CMH Full Phase Spectrum for optimal plant growth. It delivers a total output of 1090 µmol/s with a system efficacy of 2.6 µmol/J.
2. Safety Information
- Always disconnect the power supply before installation, maintenance, or cleaning.
- Ensure the installation area is dry and free from excessive moisture. This product has a Water Resistance Level of Waterproof, but proper electrical safety precautions should always be observed.
- Do not look directly into the LED lights when the unit is operating, as this may cause eye strain or damage.
- Ensure the mounting structure can safely support the weight of the fixture.
- Keep the light away from flammable materials.
- Only use the provided power cord and accessories.
3. Package Contents
Verify that all components are present in the package:
- TSL ROI-E420 LED Grow Light Fixture
- Mounting Hardware
- Power Cord
4. Setup and Installation
The TSL ROI-E420 LED Grow Light is designed for ceiling mount installation. The fixture comes pre-assembled and does not require complex assembly.
4.1 Unfolding the Fixture
Carefully unfold the LED light bars until they are fully extended. The fixture features a hinge mechanism with an integrated level to assist in proper alignment.

Figure 1: Hinge mechanism with integrated level for precise unfolding.
4.2 Mounting the Light
Use the included mounting hardware to securely attach the fixture to a sturdy ceiling structure. Ensure the light is level and stable before proceeding.

Figure 2: TSL ROI-E420 LED Grow Light in its fully unfolded configuration.
4.3 Electrical Connection
Connect the power cord to the fixture and then to a suitable electrical outlet. The light operates on a Corded Electric power source.
5. Operating Instructions
The TSL ROI-E420 LED Grow Light offers multiple control methods for adjusting its operation.
5.1 Dimming Control
The fixture is equipped with a dimmer switch, allowing you to adjust the light intensity. Rotate the dimmer knob clockwise to increase brightness and counter-clockwise to decrease it.

Figure 3: Control panel with dimmer knob and ports.
5.2 Remote and App Control
The ROI-E420 supports remote control and app control functionalities. Refer to the separate instructions for pairing with a remote control or connecting to the dedicated mobile application for advanced settings and scheduling.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your LED grow light.
- Cleaning: Periodically clean the light fixture and LED surfaces with a soft, dry cloth. Ensure the unit is unplugged and cool before cleaning. Do not use abrasive cleaners or solvents.
- Inspection: Regularly inspect the power cord for any signs of damage. Check mounting hardware for tightness.
- Ventilation: Ensure adequate airflow around the fixture to prevent overheating.
7. Troubleshooting
If you encounter issues with your TSL ROI-E420 LED Grow Light, refer to the following common solutions:
- Light Not Turning On:
- Check if the power cord is securely plugged into both the fixture and the electrical outlet.
- Verify that the electrical outlet is functional.
- Ensure the dimmer knob is not set to the lowest (off) position.
- Light Flickering:
- Check for loose connections in the power cord.
- Ensure the power supply is stable.
- Dimming Not Responding:
- Ensure the dimmer knob is clean and free of obstructions.
- If using remote/app control, check battery levels or connection status.
8. Specifications
| Model Number | ROI-E420 |
| Brand | TSL |
| Wattage | 420 watts |
| Voltage | 10 Volts (DC) |
| Light Source | LED |
| Brightness | 746 Lumens |
| Efficiency | 2.6 µmol/J |
| Control Method | App, Remote Control |
| Switch Type | Dimmer |
| Indoor/Outdoor Usage | Indoor |
| Mounting Type | Ceiling Mount |
| Water Resistance Level | Waterproof |
| Shade Material | Aluminum |
| Color | Silver or Gray |
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official TSL website. Keep your proof of purchase for warranty claims.