The ornamental design for an ledlighttube with cryogenic liquid, as shown and described.
FIG. 1 is a perspective view of an LED light tube with cryogenic liquid showing my new design;
FIG. 2 is a front view of an LED light tube with cryogenic liquid;
FIG. 3 is a back view of an LED light tube with cryogenic liquid;
FIG. 4 is a right side view of an LED light tube with cryogenic liquid;
FIG. 5 is a top view of an LED light tube with cryogenic liquid;
FIG. 6 is a bottom view of an LED light tube with cryogenic liquid; and,
FIG. 7 is a front view of an LED light tube with cryogenic liquid in use with light emanating from the LED light into the environment and showing heated cryogenic liquid within the light tube.
Right side views not shown are mirror images of left side views. Any broken lines illustrative of environmental structure in the drawings are not part of the design sought to be patented.