For UV LEDs my usual advice is to find a 6V LED and run a 5/6V Ubec up to it or run the Ubec and use a 3.3V inline converter. It may cost a few extra bucks more but will run steady and have the whole chamber charged and ready from the time you start your tank or use a RX controlled switch to activate it.
Also, to view an IR LED, an easy way is to use your phone camera. Try to get a half dark area and point the IR LED at the camera and add power, it should glow on your phone screen.