I went there to take the blue pix. Canon 10D with a 12-24 likely set to about 14 and 5.6 with a split DN filter 2 second exposure ISO 100. I got just exactly what I wanted.
Then I hung around and got the purple and red one too the only thing that changed was the exposure. About 18 minutes for the sequence. A little bonus there.
And still had plenty of time to make it into work on schedule.