A piston pump includes a piston assembly which has a first piston element, a second piston element, and at least one transverse bore which corresponds to a longitudinal bore. Then, the input torque value is updated to a value determined based on the first input torque value and a second input torque value estimated when it is determined that the accelerator pedal has been operated by at least a predetermined amount. The ultrasound probe includes at least one ultrasound transducer and a plurality of application specific integrated circuits. Tanning lamps containing these blends exhibit increases in initial UVA output and UVA maintenance.