Edwood, that is an intersting question. I just realized that all this talk about the LS is with the supplied optics. I always wondered how using more than 1 LS in a flashlight could be possible, but then i remembered that they come without optics too. How would they look without optics?
Also, considering how we can only get 5-9 hours of light out of 1 LS...i'd hate to know how long 2-3 LS's would last.