Just a guess, but maybe the "Pro Line" is a set of Smart Home products that is made available to an alternate distribution channel for marketing/sales purposes to allow for bulk purchases & discounts without cannibalizing the DIY direct pricing at the web site.

There are no higher wattage device in the Pro Line that I can find.

The Pro Line products have a different model number but most are the same as the DIY ones. There are a few special devices. Like a small computer like controller and active phase bridge.

I believe they do get Pro Line prices but may also have to handle any warranty claims.

 

The higher wattage was thought of because it was not a residential installation and the total wattage supported. Had to include the highest wattage bulbs the fixture could handle times the number of bulbs being controlled. Even if you didn't use the highest wattage bulb it was rated for.