I claim the ornamental design for hi-output CF cluster lamp, as shown and described.
FIG. 1 is a perspective view of my hi-output CF cluster lamp, and the broken lines show that threads for securing the lamp into an electrical socket and the broken lines showing light bulbs are all for illustration purposes only, and form no part of the claimed design.
FIG. 2 is a bottom view of my hi-output CF cluster lamp shown in FIG. 1, and the broken lines showing the lamp bulb sockets are for illustrative purposes only, and form no part of the claimed design; and,
FIG. 3 is a side view of one side of my hi-output CF cluster lamp shown in FIG. 1 as viewed from another rear location.