I bought this light on ebay - from seller ultrapire I believe - and for ~$7
Cons: no lens oring, 1.75A at tail on high, emitter had a little spec of dirt under the dome, plastic pressed in switch retainer in tail, one clip screw stripped, pill doesn't screw in like my sk68 clone (it is pushed down by a screw in retainer and pushed up by the battery contacting the driver spring). Has strobe mode (although at least it is relatively slow).
Pros: tailcap more ergonomic than sk68, 18650
The mods: filed the grooves in the sliding piece for more grip - they're quite deep now. sandblasted bezel and slider, painted w/ vht flameproof flat black, sanded high spots on slider and crown. Sanded body and tailcap.
flattened (hammer, mill file) the end of two 1/2" copper pipe caps.
Trimmed one (with grinder) to ~2mm deep cup. interior of 1/2" cap is PERFECT for 16mm star.
shortened 2nd cap to ~.250" (deep as possible w/ a few .001" to clear the shoulder just above positive end of battery)
arctic epoxied the two flat ends together.
drill holes for leads.
trimmed OD of driver just enough to fit in pipe cap.
aligned cupped end of the cap w/ the screw in piece that formerly held the pill onto the battery and squeezed them together in my vice.
You can see there's a little shoulder inside the bottom of the screw in piece - these two parts just happened to be a nearly perfect fit - I just beveled the end of the 'cup' so that it would start in straight.
I put an xm-lt6 in. It draws 2.3A at the tail from a good cell w/ 4.04V. 0.4A on low.
AWESOME light for my purposes now. Gets warm fast but not too hot, low is low enough. I can generally find all three dogs in the yard w/ the flood and zoomed I can check the adjoining yards.
Note - if you do this mod, and want full focus on zoom, make the cup twice as deep as I did (~3 pcb thicknesses total) - I get a square beam but no emitter lines (I wanted wider flood).
and now the pics