I typically use a headlamp at a range of 6"-5', the energizer ones I've tried all have these "cool" different modes - some with a bright mode, blue mode red only mode, etc. But all i need is a really bright version of the LED on a smartphone such as an iPhone where the beam is relatively wide and even. Dimming isn't even that necessary as I can always tape on an ND gel filter or something. Are there any economical solutions out there (say, under $30)? I'm not opposed to modding/building/buying parts from china to assemble, I have some background in electronics and am comfortable wiring LIPO PCMs and such. The title should also be relatively solid - the energizer ones I've tried are just fine for my purposes in that respect but some of the cheap ones I've ordered directly from china don't stay in place while a person is walking. Any suggestions are greatly appreciated. Thanks!