1. Introduction
The OLIGHT Seemee 30 C is a compact and powerful bike tail light designed to enhance cyclist safety. With a maximum output of 30 lumens and 230-degree visibility, it ensures you are seen from up to 800 meters away. Featuring an ambient light sensor, USB-C rechargeable battery, and IPX6 waterproof rating, the Seemee 30 C is a reliable companion for both daily commuting and urban riding, day or night.
Key Features:
- High Visibility: 30 lumens max output with 230-degree visibility, viewable from 800m.
- Smart Sensor: Automatically adjusts light mode and output based on ambient conditions.
- USB-C Rechargeable: Convenient and fast charging with a built-in battery indicator.
- Durable & Waterproof: IPX6 rated for reliable performance in various weather conditions.
- Long Runtime: Up to 90 hours of maximum runtime on a single charge.

Figure 1: OLIGHT Seemee 30 C Key Specifications and Features.
2. Setup and Installation
2.1 What's in the Box
- OLIGHT Seemee 30 C Tail Light
- USB-C Charging Cable
- Mounting Strap
- User Manual

Figure 2: Package Contents of the Seemee 30 C.
2.2 Charging the Device
Before first use, fully charge the Seemee 30 C. The light features a convenient USB-C charging port. The built-in battery indicator will 'breathe' to show it is charging.

Figure 3: USB-C Charging Port.
2.3 Mounting Instructions
The Seemee 30 C is designed for easy, tool-less mounting on seat posts with a diameter of 22-32mm+, compatible with both standard and aero seat posts. The translucent housing design provides superior side visibility.
- Place the light against the seat post.
- Wrap the rubber strap around the seat post.
- Secure the strap to the hook on the light.

Figure 4: Easy Mounting Process.

Figure 5: Installation Steps Diagram.

Figure 6: Side Visibility Feature.
3. Operating Instructions
3.1 Power On/Off and Mode Selection
The Seemee 30 C is simple to operate with a single button control.
- Power On/Off: Long press the button to turn the light on or off.
- Cycle Modes: A short press will cycle through all available modes.

Figure 7: Simple One-Button Operation.
3.2 Smart Mode (Auto-Adjust Brightness)
The built-in light sensor detects ambient conditions in real-time and automatically adjusts the light mode and output, ensuring optimal visibility and energy efficiency.

Figure 8: Auto-Adjust Brightness in action.
4. Modes and Runtime
The Seemee 30 C offers various lighting modes to suit different riding conditions, optimizing both visibility and battery life.

Figure 9: Detailed Runtime Chart.
| Mode | Output (Lumens) | Runtime (Minutes) |
|---|---|---|
| High | 9 | 60 (190 total) |
| Low | 2 | 50 (1060 total) |
| Flash | 0/9 | 1230 |
| Group Ride (ECO) | 0/2 | 5400 |
| Smart (Day) | 0/30 | 870 |
| Smart (Night) | 2/30 | 450 |
5. Maintenance
To ensure the longevity and optimal performance of your OLIGHT Seemee 30 C, follow these maintenance guidelines:
- Cleaning: Wipe the light body and lens with a soft, damp cloth. Avoid using abrasive cleaners or solvents.
- Charging: Recharge the battery regularly, even if not in frequent use, to maintain battery health. Avoid completely draining the battery.
- Storage: Store the light in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, charge the battery to approximately 50% every few months.
- Waterproof Seal: Ensure the USB-C port cover is securely closed after charging to maintain its IPX6 waterproof rating.
6. Troubleshooting
If you encounter issues with your Seemee 30 C, try the following steps:
- Light Not Turning On:
- Ensure the battery is charged. Connect to a USB-C power source and check the charging indicator.
- Perform a long press on the button (approximately 1-2 seconds) to ensure it's not just a short press cycling modes.
- Light Not Charging:
- Try a different USB-C cable and power adapter.
- Ensure the charging port is clean and free of debris.
- Dim Light or Short Runtime:
- Ensure the light is fully charged.
- Check if the light is in a low-power mode. Cycle through modes with a short press.
- Battery performance can degrade over time with extensive use.
- Mounting Issues:
- Ensure the rubber strap is correctly positioned and secured.
- Verify your seat post diameter is within the compatible range (22-32mm+).
If problems persist, please refer to the official OLIGHT support channels or the full user manual PDF.
7. Specifications
| Specification | Value |
|---|---|
| Brand | OLIGHT |
| Model Name | SEEMEE30-BK-300000 |
| Color | Black |
| Material | Polycarbonate |
| Product Dimensions (LxWxH) | 2.58" x 0.98" x 0.89" |
| Brightness | 30 lumen (Max) |
| Number of Settings | 5 |
| Mounting Type | Seatpost Mount |
| Auto Part Position | Rear |
| International Protection Rating | IPX6 |
| First Available Date | November 17, 2023 |
8. Warranty and Support
8.1 Warranty Information
OLIGHT provides a lifetime warranty for products purchased after January 1st, 2023. Please retain your proof of purchase for warranty claims.
8.2 Additional Support
For more detailed information, troubleshooting guides, or to contact customer support, please refer to the official user manual PDF or visit the OLIGHT website.





