I see the 6 lamp t5 f bays with a black and white for one linear disconnect,,2 lamps,,then again for 2 lamps and then a 3 port disconnect for a switched and emergency. When i see grey and purple its usually for lighting control panels. I despise the fixtures that come with the single disconnects,,, I cut the ballast side wires and flip it over and use my 4 port cnnector(because i dont carry 3 port only 2s and 4s)to connects the 2 12/2s and re connect the ballast to the other end of the disconnect.
All lay in lights should have a hot in and out disconnect IMO,,,.