The ornamental designs for an reflective laserlinegenerator with a single lightsource and a 3D spectral cone, as shown and described.
FIG. 1 is the front elevational view of the reflective laser line generator with a single light source and a 3D spectral cone showing the new design;
FIG. 2 is the left side elevational view thereof;
FIG. 3 is the right side elevational view thereof;
FIG. 4 is the top plan view thereof;
FIG. 5 is the bottom plan view thereof; and,
FIG. 6 is the back elevational view thereof.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.