Looking at Florida's laws, you probably do need an actual headlight that emits a steady light, if you want to be street-legal at least. For a self-contained, removeable light with enough power to get noticed, I'd probably reach for my Fenix L2D Q5 and strap it to my handlebar with a LockBlock, which is about a $65 setup if you already have rechargeable NiMH AA cells to feed it. A front blinkie in clear or amber would make a good addition, providing some side visibility and the eye-catching blinkie effect.