I have 2.
2 many.
I try to justify this with things like: "I need this light because someone will want a holster made for it." But then it get's difficult when you have three of the same light. It also doesn't hold water when you send them to Milkeyspit to modify. I have very few lights under the $50 mark. I do sometimes go on major "weeding" campaignes and sell a bunch off in the Marketplace, but then like a cancer, the collection grows again.
Who can resist things like the 4 Sevens Turbo X or a NIB Pentagon light that hasn't been manufactured for years especially when you can put a Malkoff drop in in it?
I will say the only light I have that I don't use is a Pentagon that is still in the packaging. Some don't get used as often as others (Olight SR91) but that is a special purpose light, and while it does get used, it's just not as often as the others. I tend to rotate lights on my belt depending on what I'm doing. Most recently it's been a Pentagon X2 with a Malkoff M61w, Turbo X, and Milkeyspit Throwyboy. I often have a Nitecore NDI in a pocket as a backup, but there is always a Revo in my Leatherman pouch right next to the leatherman as the ultimate backup. Night hikes in the desert I'll have my S12 and/or the SR91. When on a search, I'll pack along the Tomohawk and a Zebralight H60W. The H60W gets used daily for leatherwork, and I have 3 H50's used for when cleaning firearms and in bug out bags. I like to keep all different battery types around just in case one particular battery type becomes hard to find in an emergency, but I keep a very large stock of CR123s on hand.