Slightly off topic John,
But over here, it's become almost standard practice to put a plug and un-switched socket on the cord of HID lights in warehouses.
This isn't a regulatory requirement, it is just an idea that someone had somewhere along the line and has been copied ever since.
Now, this doesn't speed up your work much, but it makes things a LOT easier if you have to fault-find a particular fitting or replace any of the parts in it, it can all be done at ground level on a safe footing.
BTW, 30 minutes to replace a ballast is doing rather well, especially when you consider how some HID fittings are constructed, as well as avoiding the sharp edges on the control gear enclosure.
Some people have no idea what it takes to fault-find and repair lighting circuits, especially building owners, they seem to equate it with changing a light bulb in a house.
