DIY 7W LED with power battery Power Bank

Make LED 7W with 14 Emitter LED. Step-up voltage from 5V to 23,3V/DC http://obengplus.com/artikel/articles/159/3/Menganti-lampu-Emergency-dengan-lampu-LED.html 00:06 Verified Parallel or series LED 00:29 Circuit Step-up from Powerbank to LED 7W 00:36 Calibration input power LED. Save point 3,3V/DC, but maximum between 3,5V - 3,7V/DC 01:12 See how input voltage for LED. 7 LED x 3,3V/DC = 23V/DC 01:23 Adjust Maximum output powerbank 5V 500mAh.