:beer: I figure about 4 diodes running along the indention where the host would sit would manage it well if you want to go for something low-key. Then all you would need to do is rotate the host once.
Another option that may work even better though is lining it with 405nm LED's. That will give you much better spread and help you activate all of the powder.
For activating the LED's or Diodes, I would recommend an on/off switch instead of having it stay on when the case is closed or open or something. Simply because of lifespan issues.
For the lining, I highly recommend some velvet cloth. I used blue for mine, YMMV however.