1. Úvod
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. Bezpečnostní informace
- Bezpečnost očí: 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.
- Bezpečnost baterie:
- Use only the specified battery type (12 AA Alkaline batteries).
- Ensure correct battery polarity (+/-) when installing.
- Nekombinujte staré a nové baterie ani různé typy baterií.
- Pokud svítilnu nebudete delší dobu používat, vyjměte baterie, abyste zabránili jejich vytečení.
- Použité baterie zlikvidujte zodpovědně v souladu s místními předpisy.
- Nepokoušejte se dobíjet nedobíjecí baterie.
- Teplo: The flashlight may become warm during prolonged use. This is normal. Avoid covering the flashlight or placing it on heat-sensitive surfaces during operation.
- Voděodolnost: This flashlight is NENÍ voděodolnýAbyste předešli poškození, vyhněte se vystavení vodě nebo vysoké vlhkosti.
- Děti: Uchovávejte mimo dosah dětí. To není hračka.
- Skladování: Když svítilnu nepoužíváte, skladujte ji na chladném a suchém místě.
3. Obsah balení
Zkontrolujte prosím balení, zda neobsahuje následující položky:
- Harbor Freight Quantum 3700 Lumen Ultra-Bright LED Zoom Flashlight (QFL-3700)
- 12 x alkalické baterie AA
4. Vlastnosti produktu

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 jasné osvětlení: Delivers 3700 lumens for powerful light output.
- Rozšířený rozsah: Projects light up to 850 feet (approximately 259 meters).
- Long Run-Time: Poskytuje až 13 hodin nepřetržitého provozu.
- Nastavitelné zaostření (zoom): Twist-to-zoom mechanism allows seamless transition from a wide floodlight to a narrow spotlight.
- Odolná konstrukce: 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.
- Zdroj napájení: Funguje na 12 alkalické baterie typu AA (jsou součástí balení).
5. Nastavení
5.1 Instalace baterie
The QFL-3700 flashlight requires 12 AA alkaline batteries for operation. The batteries are included with your purchase.
- Odšroubujte zadní krytku svítilny otáčením proti směru hodinových ručiček.
- 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. Návod k obsluze
6.1 Zapnutí/vypnutí
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. Údržba
- Čištění: Otřete tělo svítilny měkkým hadříkemamp tkanina. Nepoužívejte abrazivní čisticí prostředky nebo rozpouštědla.
- Výměna baterie: 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.
- Dlouhodobé skladování: 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.
- Mazání: The O-rings and threads may benefit from occasional lubrication with silicone grease to maintain smooth operation of threads and prevent wear.
8. Řešení problémů
| Problém | Možná příčina | Řešení |
|---|---|---|
| Svítilna se nezapne. |
|
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| Světlo je tlumené nebo bliká. |
|
|
| Funkce zoomu je ztuhlá. |
|
|
9. Specifikace
| Model: | QFL-3700 |
| Světelný zdroj: | LED |
| Jas: | 3700 XNUMX lumenů |
| Dosah paprsku: | Až 850 stop (259 m) |
| Doba běhu: | Až 13 hodin |
| Zdroj napájení: | 12 x alkalické baterie AA |
| Materiál: | Hliník |
| Speciální funkce: | Adjustable Focus (Zoom) |
| Voděodolnost: | Není odolný vůči vodě |
10. Záruka a podpora
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 webwebu nebo na obalu vašeho produktu.
Please have your product model number (QFL-3700) and purchase date available when contacting support.





