The ornamental design for a dstyletubelighting, as shown.
FIG. 1 is a front elevation view of a D style tube lighting showing my new design, and it is understood that the right side, left side, and rear elevation views of the D style tube lighting are identical to the view in FIG. 1.
FIG. 2 is a bottom plan view thereof, and it is understood that the two D style tubes are identical and that the broken lines represent the mounting brackets and inductor coil assemblies; and,
FIG. 3 is a perspective view thereof, and it is understood that the broken lines represent the mounting brackets and inductor coil assemblies.