This post is a reply/continuation to a discussion on BikesZone.com forums: this and this.  The discussion is about which lights to use the usual battery types like AA or special battery types like 18650 and which specific lights. So here you go:

The AA or AAA lights that are generally available to us in India or no match to 18650(battery type) lights in their lumens(lighting power), built quality and LED life. Not just 18650 lights, but any good brands like Fenix, Solarforce, JETBeam, NiteCore, EagleTac, Olight, Quark/4Sevens, SureFire, Etc., product some high quality flashlights. But lets limit this discussion to Solarforce, Fenix, Magicshine and 18650 vs AA lights.

Here is a brief of what the 18650′s are about:
18650 lights are all tactical lights and NOT generally cheapo quality lighting. If you have a wish to loose your eyesight, just look directly into them and its fulfilled instantly. Well there are both the good quality LEDs and medium quality LEDs(Bulbs I mean) in these lights. But I am yet to see one useless LED bulb from the good brands. Single cell 18650 lights are usually around 220-320 lumens.
(FYI: there are several high quality, durable, dependable AA lights which can be used for biking but rechargeable, high power, anytime, anywhere takes me to 18650 types)

I bought the New HTC Touch Pro 2 weeks back (one of the first few pieces in Hyderabad) and had been very busy with it customizing or playing the gravity games. 

Bought it for the price of 32,500/- in Jagdish Market, Hyderabad with bill and warranty. Though it was locked with Idea network, the distributor provided with the unlock code. Also bought an 8GB SDHC memory card so that I don’t have to worry about memory usage for things like MP3s, Photos or Movies.