The ornamental design for a lightdevice for dewar, as shown and described.
FIG. 1 is a rear perspective view of an embodiment of a light device for dewar showing a new design;
FIG. 2 is a front perspective view of the light device for dewar illustrated in FIG. 1;
FIG. 3 is a rear perspective view of the light device for dewar illustrated in FIG. 1 with an arm having a light in a first position;
FIG. 4 is a rear perspective view of the light device for dewar illustrated in FIG. 1 with an arm having a light in a second position;
FIG. 5 is a perspective view of the light device for dewar illustrated in FIG. 1;
FIG. 6 is an enlarged view of a hinge for the light device for dewar illustrated in FIG. 1; and,
FIG. 7 is a perspective view of the light device for dewar illustrated in FIG. 1.
The broken lines in the drawings illustrate the portions of the light device for dewar that form no part of the claimed design. Shading of FIGS. 1 through 7 form no part of the claimed design.