Lightweight, high-impact polycarbonate head is virtually indestructiblewill not dent, bend or break. Safer than conventional lights because polycarbonate housing does not conduct electricity like other models. Stays cool to the touch for easy positioning and servicing. Corrosion-resistant. Mounts quickly. Double strut metal extenders will not sag or bend over time. 40" arm length. Use incandescent lamps only.