Get good lights from known quantities and qualities. Alibaba and his 40 thieves is a poor place to shop for anything the prices are cheap for a reason and it is not good. I would agree with noglider on STvZO style lights, a good beam pattern is important. Yes a bright light is good but a flashlight is really not helpful on a bike and that is what a lot of lights are because it is cheaper and easier to make but Lezyne and even Kryptonite in their X series makes some really good lights with a great beam pattern.