I'm not sure if anyone still sells luxVs this day and age....I'll probably get a cree or a seoul and mod that in to the lamp fixtures I have around here.
light_emitting_dude, the reason your not feeling much heat is partially due to under-driving [or "starving"] the luxIII. Nominal voltage should be 3.7V [ranging from 3.1-4.5V]. Heat is your worst enemy, your setup should last you for many many good nights. LuxIIIs, if properly driven and heatsinked, wouldn't die so easily.
I've managed to sandwich 12 LuxIs on a massive heatsink and it works pretty well as a floodlight but oy...reading under it was a PITA. When you have one light source you have, thankfully, one shadow. 12 light sources will yield 12 shadows:shakehead. Reading lights are best kept to a single LED if at all possible
I've mounted a cree [XR-E warm] on a aluminum bar to illuminate some cabinet items and running on a Nokia charger. I'm thinking of mounting some under the bed and in my bedside lamp for those "when you need light at night but not enough to blind you" times.
Fair warning, it ain't pretty...as it turns out phone chargers don't like to be used continuously. I left my "cabinet light" for one whole day [24 hours at minimum] and I noticed through the plastic covers the charger was very very warm, warm enough to warm my surge protector. I unplugged it and it gave me a 2nd degree [blister] burn under the thumb when the prongs touched me