Ultra-violet

• VLMU3100-GS08 (datasheet) : 3.2V/20mA

With 30mA through the LED, there's enough UV-light to inspect your hotel bathroom when other lights are turned off.  The downside of this LED is the high forward voltage.  It's in the range of the Li-Ion supply voltage as it drops during discharge.  For the sake of circuit simplicity, we'll use 2 UV-LEDs in series and use a boost-converter to power them.

RGB

• WS2812B
  • Control by one GPIO, no PWM or large inductor needed.
  • VCC=3.5 to 5V : can be directly powered from the Li-Ion battery
  • provides many colors
  • MCU must run at ≥ 8MHz
  • tested and verified on PIN_PB1.
  • consumes 500µA to 1mA when LED is off, depending on power supply voltage

Always ON LED

• Lumileds Luxeon 3535L L135-L567003500000 : 3.1V/100mA
  • Very efficient for very low currents
  • see Ultra low power LED