I will be using a simple current source to drive UV Led strings. Each board will have 30 LEDs with 10 current sources. 1 current source will drive 3 LEDs, with that I want to keep current of LEDs under perfect control so they would have long life time.
The board will be 4x6 inches, powered with 12V, and expected current 200mA. 4 of them can fit into an old scanner and whole system can be powered by a 12V 1A power supply.
Ic > 20mA
30 Ohm Resistor
Current sensing resistor of the current source
Positive Biasing resistor of the current source