Fenix TK40
•
Cree MC-E LED (either K or M
bin) with lifespan of 50,000 hours
• 4 types of primary
output: Low (13 Lumens, 150Hrs), Medium (93 Lumens, 20Hrs), High (277
Lumens, 6.8Hrs) Turbo (630 Lumens, 2Hrs)
• 4 types of strobe:
Strobe, Slow flash, SOS, Fast flash
• Digitally regulated
output - maintains constant brightness
• Uses eight 1.5V AA
(Alkaline, Ni-MH) batteries (4 AA batteries can be used in an
emergency)
• 8.2" Long x 2.45" Diameter
•
Made of T6 aircraft-grade aluminum
• Durable Type III
hard-anodized anti-abrasive finish
• 10oz (excluding
batteries)
• Waterproof to IPX-8 Standard
• Toughened
ultra-clear glass lens with anti-reflective coating
•
Push-button tailcap switch
• Capable of tail standing on a
flat surface to work as a "candle"
• Included
accessories: instructions, shoulder strap, two spare o-rings and a
rubber switch boot

The
TK40 has a thick body and tailcap to go along with it's 2.44"
head. Even so, it is well balanced in your hand.
The tailcap
switch is not a forward or reverse clickie. Power always flows to the
head. When you press the
switch it "tells" the light to
turn on. Click and release to turn the light on (or off if it's
already on). Once it's on
click and hold to go to the next
brightness level. It's that easy. To access a strobe function, double
click.
To change to a different type of strobe, change to the next
brightness level and double click. That's it.

This
is what the battery carrier looks like. It seems pretty sturdy and
holds the batteries tightly in place.
I recommend rechargeable
batteries. They work much better than alkaline and are much cheaper
in the long run.

The
TK40 comes in a decent plastic case with handles so you can store the
light and the extra goodies it
comes with, so you always know
where to find them. Very nice touch for Fenix. Some of the extras
are
a shoulder strap and extra o-rings.
The
TK40 fits nicely in the hand and is easy to operate, although you
will need to hold it near the back of
the light to reach the tail
switch easily. 
Here
is a comparison photo of the TK40 with a 3D MAG-LITE, Surefire L6,
Fenix T1, Titan T1A and ArcAAA.
Fenix TK40 outdoor
beamshots at ~45 feet (all shots on manual settings):
Fenix
TK40 on low:
Fenix
TK40 on medium:
Fenix
TK40 on high:
Fenix
TK40 on turbo:
JetBeam
M1X:
Fenix
T1 on max:
Surefire
E2DL on high: