Difference in staging trees?

[CManT1914]

What's the difference in a Sportsman tree, a Pro .500, and a Pro .400?

 

[88POSLX]

Sportsman is when the three ambers come down one at a time, then the green. The time between the last amber and the green is 0.5 seconds. A pro tree lights all three ambers at once, then the green. The .4 and .5 is the time between amber and green.