The ornamental design for a lightfixturecover for directinglight from a bulb, as shown and described.
FIG. 1 is a front view of the light fixture cover for directing light from a bulb showing my new design;
FIG. 2 is a back view of my design;
FIG. 3 is a right view of my design;
FIG. 4 is a left view of my design;
FIG. 5 is a top view of my design;
FIG. 6 is a bottom view of my design;
FIG. 7 is a left perspective view of my design; and,
FIG. 8 is an environmental perspective view of my design showing an light bulb commonly used on an airport runway in broken lines for illustrative purposes only and forms no part of the claimed design.