I have 8 Mac 700s controlled by a Grand MA onpc. The first channel of the fixtures is at 13% are the fixtures running at 400w until channel 1 is between 96%- 97% which would change it to 700w
The lamp mode is changed only by the control channel. Under normal circumstances lamp goes into low power mode when the shutter is closed for a few seconds, but then snaps back up to full power once the dimmer moves from zero. If you set it to low power mode using the control channel (Under Shutter) then it will be in that mode until you either reset the fixture, or return it to 700W mode.