+1 on what LiteFan said. That 18650 Scorpion from Fivemega is the cat's meow :thumbsup:. Brighter and longer run time than the strion bulb on 17670. You'll still have to use a strion bulb (no big deal at all--just swap em out), and you'll have to get a complete light from Fivemega at this point (b/c it looks like he doesn't have just the tube available anymore). That's probably not what you want to hear, since you already own a scorpion--but if you wanted to spend the extra $$, the FM Scorpion is great. Just another option--I love mine.