LEDs can be bright, but even the most efficient LEDs are around 100 Lumens per Watt. It doesn't take long for a lamp that consumes a Watt, or more, to run a battery down. It is nice to have a lamp that will produce a lot of light for a short time, while being capable of operation at low light levels for good battery life. I also prefer that my battery operated equipment all use the same type of battery.