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When I'd no idea of flashlights or LED about one and half an month ago, I posted a topic raising many questions on this forum (http://www.thehighroad.org/showthread.php?p=6644231#post6644231). One of the questions was what does the word "lumen" mean. Some kindhearted friends answered me, very...

I use one-digit-dollar flashlights when I was very young and haven't used such a stuff for years. I got interested in flashlights worth dozens of dollars because friends around me often talk about them. I wonder why the stuffs are so attractive to my friends, so registered here for some answers...