Parts list & Sources
Old 3D maglite torch
Get an old one off ebay, it doesn't matter what condition its in...
Cable - Retrieved from an old kettle plug. Its was chosen to fit the cable glands. I bought those first and then found a cable to match.
5*Cree R2 1200-Lumen White Light Drop-in LED Module (52.7mm*42mm/8.4V Max)
Acrylic TubeFrom ebay, these fits the batteries I already had, three Ultrafire 18650.
CLEAR EXTRUDED ACRYLIC PERSPEX TUBE PIPING 25MM OD X 2MM WT X 12" LONG ]
Rubber stopsFrom ebay to fit the above tube, 19mm 1-Hole Red Rubber Stopper Bung Laboratory, you need one with a hole for the cable and second one without a hole.
Cable glandM20 CABLE GLAND, HYLEC, 56020M-LLNC, again from ebay for a couple of £ each.
0 ringsI bought two sizes, one for the head unit and one for the base of the light unit, in the end I didn't bother with the smaller one on the base, but here are the sizes:
Nitrile Rubber O-Rings 48mm x 2mm 48 ID x 2 Thick NBR70
BS124 Nitrile Rubber O-Rings 31.42mm x 2.62mm 1.237" x 0.103" NBR70
Other bits/off ebay.JB Weld
GRANVILLE INSTANT GASKET RTV SILICONE CLEAR SEALANT 40G TUBE