1. Introduktion
Thank you for choosing the Harbor Freight Quantum 3700 Lumen Ultra-Bright LED Zoom Flashlight, Model QFL-3700. This manual provides essential information for the safe operation, setup, maintenance, and troubleshooting of your new flashlight. Please read this manual thoroughly before use and retain it for future reference.
The QFL-3700 is designed for powerful illumination with its 3700 lumens and adjustable zoom function, making it suitable for various tasks requiring bright, focused, or wide-area lighting.
2. Sikkerhedsoplysninger
- Øjensikkerhed: Do not look directly into the LED light or shine it directly into the eyes of people or animals. The high intensity light can cause temporary vision impairment or permanent eye damage.
- Batterisikkerhed:
- Use only the specified battery type (12 AA Alkaline batteries).
- Sørg for korrekt batteripolaritet (+/-) ved installation.
- Bland ikke gamle og nye batterier eller forskellige typer batterier.
- Fjern batterierne, hvis lommelygten ikke skal bruges i længere tid, for at forhindre lækage.
- Bortskaf brugte batterier ansvarligt i henhold til lokale regler.
- Forsøg ikke at genoplade ikke-genopladelige batterier.
- Varme: The flashlight may become warm during prolonged use. This is normal. Avoid covering the flashlight or placing it on heat-sensitive surfaces during operation.
- Vandtæthed: This flashlight is IKKE vandafvisende. Avoid exposure to water or high humidity to prevent damage.
- Børn: Holde utilgængeligt for børn. Dette er ikke et legetøj.
- Opbevaring: Opbevar lommelygten på et køligt, tørt sted, når den ikke er i brug.
3. Pakkens indhold
Tjek venligst pakken for følgende varer:
- Harbor Freight Quantum 3700 Lumen Ultra-Bright LED Zoom Flashlight (QFL-3700)
- 12 x AA-alkaliske batterier
4. Produktfunktioner

Image 1: Diagram illustrating the key features of the QFL-3700 flashlight, including its super-bright 3700 lumens, 850 ft range, up to 13-hour run-time, adjustable focus, high-grip aluminum barrel, easy-access protected on/off switch, 12 AA battery compartment, twist-to-zoom mechanism, and ridged collar.
- Ultra-lys belysning: Delivers 3700 lumens for powerful light output.
- Udvidet rækkevidde: Projects light up to 850 feet (approximately 259 meters).
- Long Run-Time: Giver op til 13 timers kontinuerlig drift.
- Adjustable Focus (Zoom): Twist-to-zoom mechanism allows seamless transition from a wide floodlight to a narrow spotlight.
- Holdbar konstruktion: Features a high-grip aluminum barrel and aluminum body with rubber-coated ends for enhanced durability and secure handling.
- Easy Access On/Off: Protected power switch for convenient and reliable operation.
- Strømkilde: Operates on 12 AA alkaline batteries (included).
5. Opsætning
5.1 Batteriinstallation
The QFL-3700 flashlight requires 12 AA alkaline batteries for operation. The batteries are included with your purchase.
- Skru lommelygtens bagdæksel af ved at dreje den mod uret.
- Insert the 12 AA batteries into the battery compartment, ensuring correct polarity (+ and -) as indicated inside the compartment. Incorrect installation can prevent the flashlight from working and may damage the unit or batteries.
- Carefully screw the tail cap back onto the flashlight by turning it clockwise until it is securely tightened. Do not overtighten.
- Test the flashlight by pressing the power button.

Image 2: A hand gripping the QFL-3700 flashlight, illustrating its size and the high-grip aluminum barrel texture. This image helps visualize the handling of the flashlight during battery installation and operation.
6. Betjeningsvejledning
6.1 Tænd/sluk
The power button is located on the tail cap of the flashlight. It is designed for easy access and is protected to prevent accidental activation.
- To turn the flashlight ON, firmly press the power button until it clicks.
- To turn the flashlight OFF, firmly press the power button again until it clicks.
6.2 Adjusting the Zoom (Focus)
The QFL-3700 features an adjustable focus mechanism, allowing you to switch between a wide floodlight and a concentrated spotlight.
- To adjust the focus, gently twist the head of the flashlight.
- Twist in one direction for a wider beam (floodlight).
- Twist in the opposite direction for a narrower, more focused beam (spotlight).
- Adjust the focus as needed for your specific lighting requirements.

Image 3: The Harbor Freight Quantum QFL-3700 flashlight in its full form, showcasing the head, barrel, and tail cap. This view helps users identify the components mentioned in the operating instructions.
7. Vedligeholdelse
- Rensning: Tør lommelygtens hus af med en blød kludamp klæde. Brug ikke slibende rengøringsmidler eller opløsningsmidler.
- Udskiftning af batteri: Replace all 12 AA batteries when the light output diminishes significantly. Always replace all batteries at the same time with new ones of the same type.
- Langtidsopbevaring: If the flashlight will not be used for an extended period (more than one month), remove the batteries to prevent potential leakage and damage to the flashlight.
- Smøring: The O-rings and threads may benefit from occasional lubrication with silicone grease to maintain smooth operation of threads and prevent wear.
8. Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Lommelygten tænder ikke. |
|
|
| Lyset er svagt eller flimrer. |
|
|
| Zoomfunktionen er stiv. |
|
|
9. Specifikationer
| Model: | QFL-3700 |
| Lyskilde: | LED |
| Lysstyrke: | 3700 lumen |
| Beam Range: | Op til 850 fod (259 m) |
| Køretid: | Op til 13 timer |
| Strømkilde: | 12 x AA-alkaliske batterier |
| Materiale: | Aluminium |
| Speciel funktion: | Adjustable Focus (Zoom) |
| Vandtæthed: | Ikke vandafvisende |
10. Garanti og support
For information regarding warranty coverage, technical support, or replacement parts, please refer to the original purchase documentation or contact Harbor Freight customer service directly. Contact details can typically be found on the official Harbor Freight webwebstedet eller på din produktemballage.
Please have your product model number (QFL-3700) and purchase date available when contacting support.





