You could also look into a Wifi controlled switch or outlet. The more common brands, like Leviton or TP-Link incorporate a number of features for home/away, or sunrise/sunset scheduling. Plus, you'd have the phone app to turn them on or off as you need. You could go one step further with an...
In some of the original posts they mentioned ordering the motor cord from the 780. Does it come with the correct connector to make it a true plug and play install? I just got a 779 for Christmas and ordered the parts to add the light, but I don't see any clarification on the cord point.
EDIT...