Boost drivers are useful for when your input voltage is lower than the voltage needed to drive your LED(s).  For example, a single alkaline/NiMH has a nominal voltage of 1.5V/1.2V, which won't even turn on most high-output LEDs, which typically require 3V+.  The solution is to use a boost driver.  

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17mm MTN-BST2 Boost Driver
This boost driver (input voltage is lower than output voltage) can drive 6V LEDs, such as the XHP50...
Based on 1 reviews.
AA / AAA Small Boost Drivers - Various Models & Modes
These drivers have been pulled from various flashlights.  They have been tested and are a great..
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