Introduction
The Aputure COB 300D Mark II is a powerful and versatile LED video light designed for professional broadcast, photography, television production, and studio filmmaking. It offers impeccable color fidelity with high CRI and TLCI ratings, ensuring natural and pristine color reproduction. This manual provides detailed instructions for setting up, operating, and maintaining your COB 300D Mark II.
Key Features
- Impeccable Color Fidelity: CRI 96+ TLCI 96+ for natural, pristine color. 5500K color temperature.
- 8 Pre-programmed Lighting Effects: Paparazzi, Spark, Lightning, Bad Bulb, TV, Breathing, Flash, Explosion.
- Dual Control Methods: 2.4G 100m Wireless Remote Control and Sidus Link App Control (Bluetooth 5.0).
- Robust Design: U-Frame construction for 360-degree rotation, Handbrake locking yoke, durable control box with fanless heatsink.
- Firmware Upgradeable: Via USB interface.
- Power Solutions: Supports V-Mount batteries for portable operation.
What's in the Box
The Aputure COB 300D Mark II package includes:
- COB 300D Mark II Lamp Head
- Control Box (Power Unit)
- Standard Reflector
- Quick Release Clamp
- Power Cable
- Connecting Cable
- Remote Control
- Carrying Case

This image displays the complete contents of the Aputure COB 300D Mark II package, neatly arranged within its carrying case. Visible items include the light head, the control box, various cables, and a standard reflector, demonstrating the comprehensive nature of the product.
Setup
Mounting the Lamp Head
The COB 300D Mark II features a U-Frame construction allowing 360-degree rotation for flexible mounting. Secure the lamp head to a light stand using the Handbrake locking yoke.
This video demonstrates the physical installation of the Aputure COB 300D Mark II LED video light, including mounting the lamp head onto a stand and securing it with the handbrake locking mechanism. It also shows the quick release clamp installation and battery power setup.

This image provides a close-up view of the light's U-frame and handbrake locking yoke, illustrating how the light can be rotated 360 degrees and securely locked into position for optimal lighting angles.
Installing the Quick Release Clamp
Attach the quick release clamp to a C-stand or other compatible stand. This clamp securely holds the control box.

This image showcases the quick release plate and clamp system, detailing how the control box can be easily and securely attached to a light stand or other rigging.
Powering the Light
Connect the lamp head to the control box using the provided cable. The control box can be powered via AC or V-Mount batteries.
For full power, two V-Mount batteries are required. A single V-Mount battery will provide up to 50% light output.

This image displays the control box with two V-Mount batteries attached, highlighting the portable power options available for the light, allowing for operation without direct AC power.
Operating the Light
Control Box Operation
The intuitive control box allows you to adjust brightness, channels, and fan speeds. It features a fanless heatsink design for silent operation.

This image shows the control box display, indicating the current dimming percentage and channel/group settings, demonstrating the stepless dimming capability from 0% to 100%.
Brightness Adjustment
Rotate the brightness wheel on the control box to adjust the light output from 0% to 100%.
Channel and Group Selection
Use the "Channel" and "Group" buttons to select the desired channel and group for multi-light setups.
Lighting Effects (FX Mode)
The COB 300D Mark II includes 8 built-in lighting effects:
- Paparazzi
- Spark
- Lightning
- Bad Bulb
- TV
- Breathing
- Flash
- Explosion
Press the "Effects" button to cycle through these modes. Use the "Trigger" button to activate effects instantly.

This image illustrates the variety of 8 pre-programmed lighting effects, such as Paparazzi, Spark, and Lightning, that can be utilized with the light to enhance creative productions.
Remote Control Options
The light can be controlled via:
- 2.4G Wireless Remote Control (100m range)
- Sidus Link App (Bluetooth mesh network protocol)
- DMX512-compatibility

This image shows various mobile devices featuring the Sidus Link App logo, demonstrating the light's capability for remote control via a smartphone or tablet application.

This image highlights the control box's multiple ports, including DMX512, which provide expanded options for controlling the light in professional setups.
Maintenance
Cleaning
Regularly clean the lamp head and control box with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
Storage
Store the light in its redesigned carrying case to protect it from dust and physical damage.

This image displays the redesigned carrying case, emphasizing its robust construction and soft interior lining, designed to provide ample protection for the light during transport and storage.
Troubleshooting
Light Not Turning On
- Ensure all cables are securely connected.
- Verify AC power supply or V-Mount batteries are charged and properly installed.
- Check the power button on the control box.
Remote Control Issues
- Ensure the remote control has fresh batteries.
- Check that the light and remote are set to the same channel and group.
- Verify the 2.4G wireless connection is active on the control box.
Firmware Update Issues
- Ensure the USB drive contains the correct firmware file.
- Follow the firmware upgrade instructions carefully.
Specifications
| Feature | Detail |
|---|---|
| Operation Current | 3.5A |
| Power Consumption | 350W Maximum |
| Power Supply | AC 100~240V 50/60Hz |
| Cooling Mode | Active Cooling |
| TLCI | >=96 |
| CRI | >=96 |
| CQS | >=95 |
| Color Temperature | 5500K +-200K |
| Radio Frequency | 2.4GHz |
| Channels | 1/2/3 |
| Groups | A/B/C/D |
| Remote Ability | <=100m |
| Battery Operating Voltage | 12V-16.8V |
| APP Control Type | Bluetooth 5.0 |
| Light Dimensions (L*W*H) | 298.4*215.6*344.5mm |
| Controller Box Dimensions (L*W*H) | 278.6*126.7*96.7mm |
| Item Weight | 6.6 pounds |
| Product Dimensions | 11.75 x 8.49 x 13.56 inches |
Warranty and Support
For warranty information and technical support, please refer to the official Aputure website or contact their customer service directly. Keep your purchase receipt for warranty claims.
For further assistance, visit the Aputure Store on Amazon.





