For review I have the Prairie Fire T6-D7  XM-L  1x18650 5 mode flashlight ...  From DX 

Now it only took some 4 months or so for DX to get this light out the door , so not impressed with the delivery time at all . Other online dealers seem to be doing much better , so vote with your $$ cash . 

Anyhow , getting past DX .

Surprisingly nice little light I must say , little , well its not much bigger than a p60 

And there are some very nice XM-L lights out there that could replace a p60 host if you wanted a XM-L that ran 18650 ...

My only (2) complaint , well there are two of them , is the insanely low PWM on low , I measured some 61.2Hz , thats so low you can see it pulsing with the naked eye .

The other is , you cant get the emitter centred in the reflector as one side of the reflector pushes off the neg wire , so as you tighten , the reflector gets pushed slightly to one side , ouch ! 

Other than that :  

The light is built as 3 major components , the Head , the body , and the tailcap . Everything screws together well , very nice tolerances , very nice fits , generally this light is put together above average , and I must say , in the last year , budget lights have been much better made than say 2 or 3 years ago . 

The battery fits really well 

Here you can see the interesting way the tailcap was put together ... 

Here is the head : The emitter and driver are in a pill that screws out 

Now I kind of like this arrangement , as it makes life easy if you want to mod etc . 

I have to say Im very pleased with the build quality of this light , some one went to at least some effort to manufacture a good product ..

There is nothing shoddy about this light , though some may make light  of the name , this product has impressed with the build quality . 

Lets check out the performance:  

Fireworm 18650 

 First measurements were with the MM and light box at the same time , then I did light box + with the tailcap on so you  can see how the tailcap affects performance . 

High - 2.6A - 850L...........Lets do it with the Tailcap on = 735L

Med - 1.433A - 480L........" + Tailcap " = 394L

Low - 0.72A - 250L.........." + Tailcap " = 214L 

Lets check out the Sanyo 2600 , an excellent battery  , 

with the Sanyo I saw some 3.7A (thats 1.1A increase over the Fireworm) and some 1100+L which sagged to 1040L and seemed to hold (3.6A) less tailcap .

With the tailcap , I saw some 870+L which sagged to 825L and looked to hold ...

Moving to throw @ 1Meter ...

Fireworm = 20000Lux on High , 11200Lux on Medium and 5100Lux on Low

Sanyo 2600 = 23600Lux on High , 12400 on Medium and 6300Lux on Low 

Beam is very typical XM-L , white hotspot , yellow greeny corona , with a sort of blue purple tint spill ...  [ depending on how you see color ] , so Im being very general here .

So as one can tell , the tailcap does affect performance a lot , so simply working from current readings alone , would offer a false representation of the lights capability as its an important part of the equation , but one certainly can see there is potential if one were willing to seek a solution to the added resistance of the tailcap . 

Beams tonight : 

Low - Medium - High  ....  3 different angles ... 

Took the light for a walk , nice , not overly large or heavy ..

Shinning it into the local park , it threw ok but the beam spreads out a little faster than other lights ..  But still a very nice thrower for size .

Low mode is a little on the high side (200L+) , the light does not tailstand well as the tailcap protrudes a little 

Glass Lens 

Aluminium Reflector (Smooth)

5 modes [ High - Med - Low - Strobe - SOS ]

No mode memory

Well cut threads

Nice even anodizing

Nice tolerances between parts 

PWM = YEs , very low 61Hz on Low , around 120Hz on medium