LED nail lamp for one finger. Power button. Connect USB.
I use UV LED EDEV-1LA1
http://youtu.be/Hj5XnR12chk
http://youtu.be/GlA-KjwMlBs

I did a complete upgrade of the lamp for manicure.
Added another LED and some improvements of the box.

Main components:
NSI50350AST3G Constant Current LED Driver
http://www.onsemi.ru.com/pub_link/Collateral/NSI50350AS-D.PDF
EDEV - 1LA1 UV LED
http://edison-opto.com.ua/doc/UV_Edixeon_v1.1.pdf
Microswitch TACT PCB
http://www.tme.eu/en/Document/fc4b091434be7442f4b5d56cf1ece96e/dtsm32n.pdf