The Ferei W151S/W151SN LED Diving Flashlight stands as a shining example of compact power and precision engineering, purpose-built for both professional and recreational divers who require dependable illumination in extreme underwater conditions. Designed to deliver high output in a lightweight, robust form, this flashlight offers the perfect balance between functionality, efficiency, and durability. It is particularly suited for divers exploring narrow wrecks, underwater cave systems, reef corridors, or participating in night dives where visibility and beam penetration are paramount.

At the core of the W151S/W151SN lies a powerful XM-L2 10W LED emitter, renowned for its efficiency and consistent output. This LED, coupled with a precision-engineered aluminum reflector, delivers a maximum brightness of 1030 lumens in the cool white version (W151S) and 967 lumens in the neutral white version (W151SN). These outputs are achieved without compromising on beam quality, as the flashlight provides an exceptional throw of up to 315 meters (309 meters for NW), ensuring that even distant underwater targets are easily visible. The light beam strikes a perfect balance between throw and flood, offering a tightly focused center surrounded by a gentle halo—ideal for navigating both open and confined spaces below the surface.

The color temperature options further enhance the user experience. The W151S cool white version emits light in the 5000K–6800K range, providing a crisp, daylight-like beam that is perfect for maximum visibility in murky or deep water. On the other hand, the W151SN neutral white version offers a warmer tone in the 3750K–5000K range, better suited for revealing natural colors underwater and reducing glare against particulate matter. Divers with a preference for realistic underwater color rendition, such as underwater photographers or marine biologists, may particularly benefit from the NW variant.

Despite its formidable output and beam reach, the W151S/W151SN maintains a remarkably compact and lightweight profile. Measuring only 143 mm in length and weighing just 96.6 grams, the flashlight is incredibly easy to handle and maneuver, even when wearing thick diving gloves. Its slim, cylindrical body has a textured finish for an anti-slip grip, adding to the confident feel and secure handling in wet or low-visibility conditions. This ergonomic design ensures the light can be comfortably operated with one hand, freeing the other for gear adjustments or navigation.

The flashlight’s housing is constructed from aerospace-grade aluminum alloy, CNC-machined for precision and finished with a Type III military-grade hard anodizing process. This treatment makes the body not only scratch-resistant but also highly resistant to corrosion from saltwater. The toughened ultra-clear glass lens is built to withstand significant water pressure, allowing the flashlight to perform reliably at depths of up to 150 meters—well within the limits required for technical or deep-sea diving.

One of the standout features of the W151S/W151SN is its magnetic rotary switch. This 360-degree rotating interface is completely sealed from the internal electronics, eliminating the risk of water ingress through mechanical components. It allows divers to intuitively and reliably cycle through the flashlight’s modes even in challenging environments. The switch controls four lighting modes: high, medium, low, and blinking. These modes cover a wide range of scenarios, from full illumination during deep or night dives to low-intensity lighting for conserving battery during surface intervals or close-up inspections.

Battery compatibility further adds to the flashlight’s versatility. It is designed to run on either two CR123A disposable lithium batteries (not included) or one 18650 rechargeable lithium-ion battery (included). With the 18650 battery installed, the W151S/W151SN provides approximately 3 hours of continuous use at maximum brightness. This makes it an ideal companion for single-tank dives, exploration tasks, or backup lighting during longer excursions. Charging the battery is straightforward using the included AC009B charger and the C24 battery holder, completing a full cycle in about five hours.

Another critical feature of the W151S/W151SN is its built-in low-voltage warning system. As the battery nears depletion, the flashlight begins flashing once every minute when approximately 30 minutes of runtime remain. This advanced warning gives divers ample time to return to the surface or switch to a backup light, greatly enhancing safety during underwater operations. Additionally, the flashlight features internal protection against overheating, over-discharge, and reverse polarity—further contributing to the unit's long-term reliability and safety.

The intelligent circuitry of the W151S/W151SN ensures that brightness output remains consistent throughout the battery’s discharge cycle. Unlike cheap dive lights that dim quickly as voltage drops, this model maintains a stable beam, allowing divers to operate with full confidence that the flashlight will not suddenly reduce its brightness mid-dive. The built-in thermal regulation system also ensures that the LEDs operate within safe temperature limits, protecting both the user and the light from damage during extended high-output use.

Functionally, this flashlight can be used both underwater and on land, making it a highly versatile tool for more than just diving. Its waterproof rating of IPX8 certifies it for continuous submersion beyond 1.5 meters, and its robust build provides impact resistance up to 1 meter, so it is equally at home in rugged outdoor conditions like hiking, caving, or night-time camping where reliability and brightness are needed.

With all of these features, the W151S/W151SN is not only a high-performance dive light but also an investment in safety, performance, and long-term durability. Its compact size, powerful output, dependable runtime, and user-friendly interface make it suitable for novice divers and seasoned professionals alike. Its ability to perform flawlessly at extreme depths, coupled with thoughtful design choices like the magnetic switch and battery warning system, exemplifies Ferei’s commitment to quality and real-world usability.

Included in the complete kit are everything needed to get started right out of the box: the W151S/W151SN diving light itself, one 18650 rechargeable lithium-ion battery, the AC009B charger, and the C24 battery holder. These accessories ensure that users can immediately begin charging and using the flashlight without additional purchases.

In conclusion, the Ferei W151S/W151SN LED Diving Flashlight is a top-tier choice for divers who demand compact size without sacrificing power or reliability. It combines high-intensity output, excellent throw, durable construction, and smart power management in a sleek and lightweight form. Whether you're a recreational diver exploring coral reefs or a technical diver navigating deep wrecks, the W151S/W151SN offers the performance and peace of mind you need. It is not merely a flashlight—it is a professional-grade diving tool designed to illuminate your underwater world with confidence and clarity.

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.

Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

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To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

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