Tuesday, March 27, 2012

Fenix LD01 Reviews & Comparisons

Fenix LD01 Manufacturer Specifications:
 Cree XP-G LED (R4) with a lifespan of 50,000 hours
•  Uses one 1.5V AAA(Ni-MH, Alkaline) battery
•  76.2mm (Length) x 14mm (Diameter) 
•  14.2-gram weight (excluding batteries)
•  Digitally regulated output - maintains constant brightness
•  Patented physical structure avoids circuit damaging from reverse connection of battery 
•  Reliable twist switch
•  Capable of standing up securely on a flat surface to serve as a candle
•  Made of durable aircraft-grade aluminum
•  Premium Type III hard-anodized anti-abrasive finish
•  Toughened ultra-clear glass lens with anti-reflective coating

Fenix LD01 Previews:

Fenix LD01 Description:Fenix ​​is active from the beginning of Led flashlights and made a lot of good lighting, thisis a stainless steel version of their classic AAA light and it is the second time, they make this model, but with updates. The light has 3 levels and no flashing modes. It is turned on when screwed together, there will always start in medium, a fast on / off change is too low, then high. This light is also sold in an aluminum version with almost the same specifications.


The light is delivered in a small cardboard box with a window and selected specifications printed on the box (The runtime and brightness is not for the same level).

Fenix LD01 BOX:The box contains the light, a split ring, a spare o-ring, the manual (With full specifications) and a warranty card.


The light has a OP (Orange Peel) reflector with the XP-G led at the bottom.

The head has knurling, there is not much "bite" in it.

Moving to the backside of the head there is the battery connection, the center has a bump for connection to the battery plus pole, the ring around the center is used for connection to the battery tube. The light will only turn on when the tube is touching the ring.


The threads are on the battery tube are nicely done and a o-ring makes the light waterproof. Inside the battery tube is the usual spring.

The back end of the battery tube has a hole that can used to mount the split ring and because of the grove the light can still tail stand.

Here is all the part the light can be disassembled in without tools.

This light is a solid and well-functioning light and because of the steel it can handle almost any keychain use. The first lights Fenix ​​LD01 had not made a really low level, it was a few generations and fixes that light has both a good and a good low level high level. The automatic reduction of high battery life will be extended at the expense of an invisible drop in brightness.

Fenix LD01 Specificiations:

This light is designed for 1.5 volt AAA batteries (Alkaline, NiMH, Lithium).

Measured size and weight:
Length: 76.1 mm
Diameter: 14.4 mm
Weight: 53 gram with eneloop

The light uses a Cree XP-G R5 led.

In the above table I have used 800mAh eneloop batteries for measuring and estimating the runtime. The estimated lumen are based on the specified 77 lumen and then scaled according to measured brightness. High will automatic be reduced after some minutes.
Note: The above table is based on values at 1.2 volt.

I have automated the metode I uses for voltage sweep, this has made it possible to use much higher resolution, add a power curve and do runs at different brightness settings. The light tries to stabilizes the brightness down to 1 volt. The maximum current draw is around 1.8 ampere, but will drop nicely when the battery voltage goes down, this prevents the light from turning off when the battery is nearly empty, instead it will run with low brightness as can be seen on the runtime curve.

The reduced high output works the same way, but stabilizes down to 0.8 volt and has reduced the maximum current drain to 1.25 ampere.

Medium can keep the stabilization down to 0.63 volt.

Low will stabilize down to 0.45 volt.

I have tested multiple LD01 lights and one of the lights showed this curve, where the stabilization is lacking. This is probably due to component tolerances.

The runtime clearly shows that the light reduces brightness after some time and that alkaline has a very short runtime (on high).

The light uses current control and has no flashing modes.

Fenix LD01 Comparisons:
TITANER ET20 XP-G R5, Fenix LD01 SS XP-G R5, 4Sevens Preon Revo SS XP-G R4 NW

4Sevens Preon Ti XP-G R5, Olight Xmas 2010 XP-G S2, Klarus Mi10 XP-E R2

For the full comparison to other lights with graphs and beamshots see here.

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