I just did some quick testing with both of my D-lites hooked up to a VML (120VAC). Same power for both, from 2.0 to 6.0 (25-400 Ws). I only did each power setting a couple times, so your times might vary a tenth or two because of slight variations and human error.
Recycle time (seconds):
6.0 does not work, I get an E.4 (charge fault) error. This happens when going from any setting < 6.0 up to 6, or if the lights are turned on at 6.0, the error will come out after the first pop.
Also, the first pop after being turned on always takes a bit longer. The "ready" beep usually goes off twice.