This UV lamp was made to use in the curing process of home made PCB boards.  It can also be used for many other useful purposes such as disinfecting surfaces or causing potential harm to your skin and other organs.  The body of the lamp was made out of scrap wood I had laying around and the light cover was cut from some spare plexiglass.

There are one hundred LEDs, two to a series making fifty sets in parallel with a resistor for each set.