Fenix LD42 Flashlight

Max Lumens: 1000
Modes: 5
Battery: AA
(15 customer reviews)


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The Fenix LD42 is a AA battery powered flashlight that can throw 1000 lumens a maximum distance of 1148ft (350m). This flashlight features a patented mechanical rotary switch which allows you to quickly turn on and select between five brightness levels with a simple twist. The flat body design provides a more natural grip and large belt clip ensures a secure carry. Dustproof and waterproof underwater to two meters, and made of high-strength aluminum and plastic, this light is more than tough enough to handle any task. The LD42 is perfect for those looking for more lighting power from a AA flashlight.

EAN: 6942870306940
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Max Lumens: 1000
Modes: 5


fenix ld42 flashlight ansi specs


Length: 6.3” (159.5mm)
Body: 1.28” (32.5mm)
Head: 1.34” (34mm)


3.5 oz. (100g) excluding batteries


Four AA batteries (included)


Four AA batteries (alkaline), body clip, lanyard, holster, spare O-ring


Limited Lifetime Guarantee from Fenix Lighting USA

Additional Features of the Fenix LD42

  • Patented rotary mode switch
  • Powered by four AA (Ni-MH/alkaline) batteries
  • Stainless steel body clip
  • Flat body design for a comfortable grip
  • Digitally regulated circuit for maintaining a stable output
  • Reverse polarity protection, to protect from improper battery insertion
  • Body with anti-roll and anti-slip design
  • Light head is made of durable high-strength and oxidation-resistance aluminum; light body is made of quality plastic
  • Premium type HAIII hard-anodized anti-abrasive finish
  • Toughened ultra-clear glass lens with an anti-reflective coating


Rotate the mechanical switch to the right side to turn on the light; rotate the switchback left to the OFF mode to turn off the light.

Output Selection

Rotate the mechanical rotary switch to cycle thru OFF⇄Eco⇄Low⇄Med⇄High⇄Turbo.

Battery Specification

Type Dimensions Nominal Voltage Usability  
Ni-MH Battery AA 1.2V Recommended
Alkaline Battery AA 1.5V Usable
Non-rechargeable Battery (Lithium) AA 1.5V Usable
Rechargeable Battery (Li-ion) 14500 3.7V Banned ×


  1. Do not use the banned battery in case of overvoltage burnout in circuit component.
  2. Use quality batteries. Do not mix batteries of different brands, sizes, capacities or types. Doing so may cause damage to the lantern or the batteries being used.
  3. If the light will not be used for an extended period, remove the batteries from the light in case of damage by electrolyte leakage.

Battery Replacement

Unscrew the light head to insert the batteries with correct polarity in accordance with the graphics on the top surface of the battery compartment, then screw the light head back on.

Overheat Protection

The light will accumulate a lot of heat when used on Turbo for extended periods. When the light reaches a temperature of 60°C or above, the light will automatically step down to 300 lumens to reduce the temperature. When the temperature drops below 60°C, it will then automatically return to Turbo mode.

Usage and Maintenance

  • Disassembling the sealed head can cause damage to the light and will void the warranty.
  • Fenix recommends using quality batteries with proper built-in protections.
  • If the light will not be used for an extended period, remove the batteries, or the light could be damaged by electrolyte leakage.
  • Unscrew the tail cap half a turn or take out the batteries to prevent accidental activation during storage or transportation.
  • Long-term use can result in O-ring wear. To maintain a proper water seal, replace the ring with an approved spare (included) when damaged.
  • Periodic cleaning of the battery contacts improves the light’s performance as dirty contacts may cause the light to flicker, shine intermittently or even fail to illuminate for the following reasons:
    A: The batteries need replacing.
    Solution: Replace batteries (Ensure batteries are inserted according to the manufacturer’s specifications).
    B: The threads, PCB board contact or other contacts are dirty.
    Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.

If the above methods don’t work, please contact your authorized distributor.


  • This flashlight is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the flashlight directly into anyone’s eyes.
  • This flashlight will accumulate a lot of heat when used for extended periods, resulting in high temperature of the flashlight shell. Pay attention to safe use to avoid scalding.

15 reviews for Fenix LD42 Flashlight

Based on 15 reviews
  1. William (verified owner)

    Like the simple adjustability of the rotator switch. Not a fan of the rear button tactical flashlight on/off switch. I don’t live in a tactical war zone.

    Gave it 4 Stars because the rotator switch is a bit on the sloppy side. Other than that is a great piece.

    Eco is only 5 lumens which is great for most everything and then when you want to upset the neighborhood High is 1000 Lumens.

    (0) (0)
  2. William Metz

    If I’d read the reviews I wouldn’t basically be repeating the first review listed on the site – great flashlight, don’t mind that it may go through batteries fast (which actually hasn’t been my experience), because it was purchased for an emergency kit because it takes common batteries. I will also accept that the fault lies with me for not reading the description more closely, but Fenix’s two other flat body flashlights have aluminum bodies, it didn’t even occur to me that they would slap a plastic body on this single flat body flashlight. I think most people would prefer a slightly higher price for this flashlight with an aluminum body. Fenix are well made flashlights that are not cheap; unfortunately this one feels a bit cheap.

    (1) (0)
  3. Lafitte

    Nice lite . BRIGHT on high. Use with eneloop pro’s. Third Fenix lite in my collection

    (1) (0)
  4. Aldo V. (verified owner)


    (0) (0)
  5. Anonymous (verified owner)

    Been searching for a light that uses a common battery and will produce something bright 300+ lumens. Nice thing is that its compact and has a pretty far throw. Its quite tough to find a light that will give you this result for the duration before you go to some sort of rechargeable or 123 battery which aren’t as common should you run into a situation. Recommended

    (4) (0)
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