1. Introduction
Thank you for choosing the MetryGrow MGL100-02 100W LED Full Spectrum Plant Grow Light. This device is designed to provide optimal lighting conditions for indoor plants across all growth stages, featuring smart app control, adjustable brightness, and daisy-chain connectivity. This manual provides essential information for safe operation, installation, and maintenance.
2. Safety Information
- Read all instructions before operating the grow light.
- This product is designed for indoor use only. Do not expose to water or high humidity.
- Ensure the power supply voltage matches the product's requirements (120 Volts AC).
- Do not look directly at the LED lights when the unit is operating, as this may cause eye strain.
- Keep the grow light away from flammable materials.
- Do not attempt to disassemble or modify the unit. Refer all servicing to qualified personnel.
- Unplug the unit from the power outlet before cleaning or performing any maintenance.
3. Package Contents
Verify that all items are present in the package:
- MetryGrow MGL100-02 Plant Grow Light (1 unit)
- Remote Control (1 unit)
- Power Adapter (1 unit)
- Hanging Kit (ropes, carabiners)
- Daisy Chain Cable (1 unit, 1m/40in)
- User Manual
4. Product Features
- Genuine 100W Output: Provides powerful and efficient lighting for plant growth.
- Full Spectrum LED: Optimized light spectrum including 5000K (Cool White for Germination), 3000K (Warm White for Blooming), 660nm (Red Light for Higher Yields), and 730nm (Far-Red Light for Accelerated Growth).
- Smart APP Control: Manage lighting time (0-24h) and adjust individual red, blue, and white light brightness via the MetryGrow smartphone application.
- 8-Level Brightness Adjustment: Fine-tune light intensity for different plant stages.
- Daisy-Chain Connectivity: Connect up to 20 units for expanded coverage in larger grow areas.
- Advanced Heat Dissipation: Aluminum honeycomb design with an independent power adapter ensures efficient cooling and silent operation.
- Magnetic Control Panel: For convenient manual operation.

Image: The MetryGrow 100W Full Spectrum Grow Light highlighting its 8-level brightness and specific light wavelengths (5000K, 3000K, 660nm, 730nm) for different plant growth stages.

Image: Illustration of the aluminum cooling honeycomb design and independent power adapter, demonstrating enhanced heat dissipation.
5. Setup Instructions
5.1 Hanging Installation
- Unpack the grow light and all components.
- Attach the hanging ropes to the designated points on the grow light fixture.
- Securely hang the grow light from a sturdy support structure using the provided carabiners. Ensure the light is level and stable.
- Adjust the hanging height according to your plant's growth stage and light requirements (refer to Section 8: Growing Tips).
- Connect the power adapter to the grow light and then plug it into a standard 120V AC power outlet.
Note: This version of the grow light does not include a stand. It is designed for hanging use.

Image: The MetryGrow grow light suspended inside a grow tent, illustrating a typical hanging installation for indoor plants.
6. Operating Instructions
6.1 Manual Control
The grow light features a magnetically attached control panel for basic manual operation. Use the buttons on this panel to turn the light on/off and cycle through basic brightness settings.
6.2 Remote Control
The included remote control allows for convenient adjustment of the grow light's functions. Refer to the remote control's button layout for specific functions such as power, brightness levels, and color spectrum adjustments.
6.3 Smart APP Control (Recommended)
For full functionality and precise control, use the MetryGrow smartphone application. This allows for advanced settings not available via manual or remote control.

Image: The MetryGrow grow light illustrating its two control modes: a physical remote control and a smartphone application for Wi-Fi control.
7. Smart APP Control
7.1 App Installation and Pairing
- Download the 'MetryGrow' app from your smartphone's app store (iOS or Android).
- Register for an account or log in if you already have one.
- Ensure your grow light is powered on and your smartphone is connected to a 2.4GHz Wi-Fi network.
- Follow the in-app instructions to add a new device. This typically involves putting the grow light into pairing mode (refer to the app for specific steps, usually a button press sequence on the light or remote).
- Once paired, the grow light will appear in your app's device list.
7.2 App Functions
- 0-24h Lighting Time: Set precise on/off schedules for your grow light.
- Individual Brightness Adjustment: Control the intensity of red, blue, and white LEDs separately to customize the spectrum for different plant needs.
- 8-Level Brightness: Adjust overall brightness from 0% to 100% in 8 increments.
- Sunrise and Sunset Mode: Simulate natural light cycles.

Image: The MetryGrow app interface demonstrating independent dimming controls for red, blue, and white light, allowing users to customize the spectrum for seedling, vegetative, and bloom stages.
8. Daisy-Chain Connection
The MetryGrow MGL100-02 supports daisy-chaining, allowing you to connect multiple grow lights to a single power source for expanded coverage. Up to 20 units can be connected.
8.1 Connection Steps
- Ensure all grow lights are powered off before connecting.
- Connect one end of the provided daisy chain cable to the 'OUT' port of the first grow light.
- Connect the other end of the daisy chain cable to the 'IN' port of the second grow light.
- Repeat this process for additional grow lights, connecting the 'OUT' port of the previous light to the 'IN' port of the next.
- Plug the first grow light into a power outlet. All connected lights will power on simultaneously and can be controlled together via the remote or app.

Image: Multiple MetryGrow grow lights connected in a daisy-chain setup, illustrating how to link up to 20 units for uniform lighting across a larger area.
9. Growing Tips / Recommended Settings
Optimal light distance, dimming, and duration vary depending on the plant's growth stage. The following table provides general recommendations:
| Growth Stage | Distance (from plant top) | Dimming | Time (Light On) |
|---|---|---|---|
| Seedling | 24 inches | 50% | 18 hours ON |
| Vegetative (Veg) | 18 inches | 75% | 18 hours ON |
| Early Flower | 12 inches | 75% | 12 hours ON |
| Late Flower | 12 inches | 100% | 12 hours ON |

Image: A visual representation of recommended growing tips, including distance, dimming, and light duration for seedling, vegetative, early flower, and late flower stages.
10. Maintenance
10.1 Cleaning
- Always unplug the grow light before cleaning.
- Use a soft, dry cloth to wipe down the exterior of the light fixture.
- Do not use abrasive cleaners, solvents, or excessive moisture, as these can damage the unit.
- Ensure the cooling vents are free from dust and debris to maintain optimal heat dissipation.
10.2 Storage
When not in use for extended periods, store the grow light in a cool, dry place, away from direct sunlight and extreme temperatures.
11. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Light does not turn on | No power supply; loose connection; faulty power adapter. | Check if the power cord is securely plugged into the outlet and the light. Test the outlet with another device. Ensure the power adapter is functioning. |
| Remote control not working | Remote battery depleted; remote out of range; obstruction; remote not paired. | Replace remote batteries. Ensure you are within range and have a clear line of sight to the light. Re-pair the remote if necessary (refer to app instructions for pairing). |
| App control not working | Wi-Fi connectivity issue; light not paired with app; incorrect Wi-Fi band. | Ensure your phone and light are connected to a 2.4GHz Wi-Fi network. Check app for pairing status. Restart the app and the grow light. |
| Lights in daisy chain not working | Loose daisy chain cable connection; faulty cable. | Ensure all daisy chain cables are securely connected. Test individual lights if possible. |
| Overheating | Blocked vents; operating in high ambient temperature. | Ensure cooling vents are clear. Operate in a well-ventilated area. |
12. Specifications
| Feature | Specification |
|---|---|
| Model Number | MGL100-02 |
| Wattage | 100 Watt-hours |
| Light Source Type | LED (Full Spectrum) |
| Voltage | 120 Volts (AC) |
| Control Method | Remote, Touch, Smart App Control |
| Brightness Levels | 8-Level Adjustable |
| Coverage Area | Approximately 2x3 ft |
| Daisy Chain Capacity | Up to 20 units |
| Material Type | Acrylonitrile Butadiene Styrene, Alloy Steel |
| Installation Type | Hanging |
| Indoor/Outdoor Usage | Indoor |
| Manufacturer | MetryGrow |

Image: The MetryGrow grow light showcasing its 100W genuine power and 2x3 ft coverage area, with PPFD (Photosynthetic Photon Flux Density) measurements at 8, 12, and 14 inches height.
13. Warranty and Support
13.1 Manufacturer Warranty
The MetryGrow MGL100-02 Plant Grow Light comes with a 1-year manufacturer's warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accidents, unauthorized modifications, or improper installation.
13.2 Customer Support
For any questions, technical assistance, or warranty claims, please contact MetryGrow customer support. Our dedicated team aims to resolve your concerns swiftly and satisfactorily within 10 hours.
Contact Information: Please refer to the contact details provided on the product packaging or the official MetryGrow website.