depends on what kind of bulb you are going to drive with it, if you are dealing with a medium power bulb, like say, a 35W-50W application, I would lean towards recommending sanyo eneloop cells for their simplicity of use and low self-discharge. (they require little to no break in or maintenance cycles). If you are planning on a 50-100+W mod, go with a cell designed specifically for high current, like an elite 1700.