Tethered 100 feet. A hardlight scamp can't travel more than 100 feet from its projector. A hardlight scamp reduced to 0 HP vanishes, though its projector reconstructs it in 1d4 hours. The only way to permanently destroy a hardlight scamp is to find its projector and either repair or destroy it.
Freeze[three-actions]
The hardlight scamp holds perfectly still so it appears as a normal hologram and becomes hidden. A hardlight scamp can Freeze even while being observed and counts as being concealed.
Holospark[one-action]
The hardlight scamp shoots sparks at a creature within 60 feet. The target must succeed at a DC 17 Fortitude save or be dazzled for 1 round (1 minute on a critical failure).