High power LED flashlight power supply questions Answered
I'm currently in the process of building a high power LED flashlight from scratch. I've decided to go for AA batteries as a source of power, however, I am not sure as to whether 2 AAs will be enough to drive my LEDs.
The LEDs are from a 5W LED bulb putting out ~360lm. I'm assuming the bulb itself has 5 1W LEDs connected in some sort of configuration, but I'm going to run them in parallel.
I'm planning on running it on either Alkaline or NiMH. However, I'm not quite sure if there will be some sort of voltage drop with the load I'm going to place on the system (~1A @ 200mA each). Also, 2 NiMH will only have a combined voltage of 2.4v making me a bit skeptical as to whether it would even run.
I already have a design for the flashlight for 2 AA batteries. Adding a third battery would complicate the design though, maybe requiring me to make a battery pack or something.
So, will a 5x1W LED array in parallel run from a 2.4v NiMH power supply? Or do I have to go with 3 batteries plus a current limiting resistor?