Sofirn HS21 Headlamp User Manual

1. Introduction

Thank you for purchasing the Sofirn HS21 Headlamp. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your device. Please read it thoroughly before first use and keep it for future reference.

Figure 1: Sofirn HS21 Headlamp showcasing its red, flood, and spot light capabilities.

2. Setup

2.1 Package Contents

Please check the package for the following items:

• Sofirn HS21 Headlamp
• 18650 Rechargeable Battery
• USB-C Charging Cable
• Headband
• Spare O-rings (2)
• User Manual

Figure 2: Contents of the Sofirn HS21 Headlamp package.

2.2 Battery Installation

1. Unscrew the tail cap of the headlamp.
2. Remove the insulating paper from the positive end of the battery (if present).
3. Insert the 18650 battery with the positive (+) terminal facing towards the head of the lamp.
4. Screw the tail cap back on tightly to ensure proper contact and water resistance.

2.3 Charging

The Sofirn HS21 features a convenient USB-C charging port:

1. Locate the USB-C port on the side of the headlamp.
2. Connect the provided USB-C cable to the headlamp and to a USB power source (e.g., wall adapter, power bank, computer).
3. The indicator light will show RED during charging.
4. The indicator light will turn GREEN when the battery is fully charged.
5. Charging time for a 3000mAh battery is approximately 2 hours.

Figure 3: USB-C charging port with charging status indicators.

2.4 Attaching the Headband

The headlamp can be easily attached to the elastic headband for hands-free use. Adjust the straps to fit comfortably and securely around your head. The headlamp bracket allows for 130° rotation to direct the light where needed.

Figure 4: Headlamp rotation and headband adjustment for comfortable wear.

3. Operating Instructions

3.1 Basic Operation (Button Control)

• Turn ON/OFF: Single click the button.
• Change Brightness: From ON, long press the button to cycle through Low → Medium → High → Turbo. Release the button to select the desired brightness. The headlamp has mode memory for each light type.
• Moonlight Mode: From OFF, long press the button to activate Moonlight mode.
• Turbo Mode (White Light): From ON (white light), double click the button to activate Turbo. Double click again to return to the previous brightness level.
• Red Flash Mode: From ON (Red Light), double click the button to activate Red Flash. Double click again to return to steady Red Light.

3.2 Mode Switching (Rotary Switch)

The Sofirn HS21 features a rotary switch to easily change between different light types:

• Rotate the head part of the lamp to switch between:
• Spotlight
• Floodlight
• Spotlight & Floodlight (combined)
• Red Light

Figure 5: Easily switch between light modes by rotating the head part.

3.3 Infrared Sensor Mode

The infrared sensor allows for hands-free brightness adjustment:

1. Activate Sensor Mode: From ON, triple click the button. The light will flash once to indicate sensor mode is active.
2. Adjust Brightness: Wave your hand towards the infrared sensor (located near the main button) to cycle through brightness levels (Low → Mid → High → Turbo).
3. Turn OFF from Sensor Mode: Keep your hand in front of the sensor for 3 seconds to turn the light off.
4. Exit Sensor Mode: Single click the button to exit sensor mode and return to normal button control.

Figure 6: How to enter and operate the motion sensor mode.

3.4 Lockout Function

To prevent accidental activation, the headlamp features a lockout function:

• Lockout: From OFF, double click the button. The light will flash once to indicate it is locked. The rotary switch also locks the headlamp when in the OFF position.
• Unlock: Double click the button again. The light will turn on in Moonlight mode (or previous mode if rotary switch is used).

3.5 Control Flow Chart

Figure 7: Comprehensive control flow chart for all headlamp functions.

3.6 Product Video Overview

4. Maintenance

• Cleaning: Clean the headlamp with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• O-rings: Regularly inspect the O-rings for wear and tear. Replace them if damaged to maintain water resistance. Apply a thin layer of silicone grease to the O-rings periodically.
• Battery Care: If the headlamp will not be used for an extended period, remove the battery to prevent potential leakage. Store batteries in a cool, dry place. Recharge the battery every few months to maintain its health.
• Water Resistance: The HS21 is rated IP65, meaning it is protected from dust and low-pressure water jets. Do not submerge the headlamp in water. Ensure all caps and covers are securely fastened before exposure to moisture.

5. Troubleshooting

• Light not turning on:
  • Check if the battery is inserted correctly with the positive (+) terminal facing the head.
  • Ensure the insulating paper has been removed from the battery.
  • Check if the battery is charged.
  • Ensure the tail cap is screwed on tightly.
  • Check if the headlamp is in lockout mode (double click to unlock).
• Light flickering or dimming unexpectedly:
  • The battery may be low; recharge it.
  • Ensure the battery contacts and tail cap threads are clean.
  • Tighten the tail cap.
• Infrared sensor not responding:
  • Ensure sensor mode is activated (triple click from ON).
  • Clean the sensor area to remove any obstructions.
  • Ensure your hand is within the effective range of the sensor.
• Headlamp gets hot on Turbo mode:
  • This is normal for high-output flashlights. The HS21 has built-in Advanced Temperature Regulation (ATR) which will automatically step down the brightness to prevent overheating.

6. Specifications

Figure 8: Detailed dimensions of the Sofirn HS21 Headlamp.

Figure 9: Close-up view of the 10-LED configuration for spot, flood, and red light.

7. User Tips

• The headlamp features mode memory for each light type (Spotlight, Floodlight, Red Light), which is very convenient.
• The floodlight provides excellent wide dispersion, while the spotlight offers a condensed beam for distance.
• Utilize the red light mode for activities like night observation, camping, or reading maps to preserve your night vision and avoid disturbing others.
• While the included headband is functional, some users prefer a more robust or rubberized headband for increased comfort and stability during vigorous activities.
• It is normal for the headlamp to generate significant heat when operating in Turbo mode. The built-in temperature regulation will manage this.
• The rotary switch is highly praised for its ease of use, allowing quick mode changes even when wearing gloves.
• The included 18650 battery often meets or exceeds its stated capacity, providing reliable runtime.
• The infrared sensor works well for hands-free operation, though occasional accidental triggers might occur depending on movement.

8. Warranty and Support

For any warranty claims, technical support, or inquiries regarding your Sofirn HS21 Headlamp, please contact the original seller or Sofirn customer service. Please refer to the included user manual (PDF) for additional details and contact information.

PDF User Manual: View PDF Manual