See, this is why you have a RAIL (Redundant Array of Inexpensive Lights, don't remember where on bikeforums I read that but I didn't come up with it).

I have a cheap "3600 Lumen" Magicshine clone that works absolutely fine and came with helmet mount accessories. Looking at the box, the brand is "SecurityIng." However, just about any cheap magicshine clone with 3 Cree XML T6 LED's will work fine. The batteries on these lights are generic/interchangeable and new ones can be had for about $5. Usually they're just 4 18650 cells hooked up together and shrink wrapped.

And as backup, I have another (forget the brand name) medium power light, and a Bell Radian as my last resort headlight and main strobe.