What you'd use it for
Two Double Rainbow tubes supplied together in a case, so a matched pair travels as one kit rather than as two separate boxes. It is the straightforward two light package for crews who want the second fixture from day one and somewhere solid to keep both. The 2ft kit carries 50W tubes, the 4ft kit carries 100W tubes.
Length picks the pair of fixtures in the case: 2ft at 50W each or 4ft at 100W each.
Figures published by Quasar Science.