Got problems with the LEDs
One of the white LEDs has died and another is flickering, indicating it's going to die. Somewhat fed up because it means I'm going to have to rip them out and replace them, not an easy job when they're superglued in and the legs are soldered to the other LEDs.
I think problem is they're being overdriven, their specs say 3.0v to 3.4v, I've been running them at 3.15v and they get a bit warm, indicating they're getting more power than they can handle so I've set the DC-DC regulator down to 3.0v output and also setup a small experiment - running 6 LEDs on a breadboard being powered with another DC-DC converter at 3.0v for a week non-stop to see how they cope.