Been some time since I last did electronics, so I'm a bit rusty.
I'm building a bike light for night riding and have a 700lumen LED with Vf = 11V @ 900mA
For power I'm using NiMH batteries, but don't want to use more than 8, which will give me 9.6V
Don't suppose there's some way to run the led from just the 8 batteries?
Also, what is the most efficient way to drive a LED?