One of the best types of flashlight on the market right now are xenon rechargeable flashlights. The rechargeable batteries mean you don't have to keep constantly burning through batteries. You will also save money by not having to buy batteries as often and you will keep more batteries from ending up in land fills. A xenon bulb is also a great invention. They have many of the advantages of LED as well as the advantages of traditional incandescent bulbs. These are just incandescent bulbs which have been filled with xenon gas. This makes them significantly more efficient and allows them to last much longer. They have the brightness and penetrating power of traditional incandescent bulbs but the battery life and the durability of LEDs (both of these might not actually be QUITE as good as LEDs, but certainly a lot better than older incandescent bulbs).
One of my favorite xenon rechargeable flashlights is the Pelican 3850 Big D FireLite Xenon Rechargeable Flashlight. This thing is very heavy duty. The flashlight includes a charging base which you can attach to a wall and it also has a quick release design which allows you to remove the batteries quickly and easily with only one hand. The flashlight has a battery life of 1 hour from its primary source and 2 hours from its backup source. The flashlight is incredibly bright. It is tested to have a lumen value of 600.
Another great flashlight is the Streamlight UltraStinger. It also uses rechargeable batteries and includes a xenon bulb. The batteries can be recharged up to 1000 times before being replaced. For the average user this could last as much as 10 years. If you use the flashlight often, everyday rather, it would still last a little under 3 years before needing to be replaced. Just imagine how much money you would be spending if you had to put normal batteries in it all the time. The battery lasts a little under 2 hours on each use. The most impressive thing about this flashlight is the machined aluminum housing. It has been anodized against corrosion on both the inside and outside and looks like it can take one hell of a beating.