Photogenic Professional Lighting Powerlight Manual (various) - Manual (Page 22)

ADVANCED POWERLIGHT FEATURES
MODEL PL1250, PL1250DR AND PL2500DR
Unit Number Assignment:
This feature allows the user to assign a UNIT NUMBER (1 to 9) to each DR type
PowerLight in the studio. The UNIT NUMBER is necessary when INFRARED remote
control is used (see accessories).
To assign a UNIT NUMBER: Turn PowerLight AC power off. With unit power off,
press and hold the 1/2 UP arrow button. While holding the 1/2 UP arrow button,
turn the unit power on. Digital display should be “un #”, where # means some
number 1 to 9. Next, release the 1/2 f-stop UP arrow button. Change the UNIT
number using the 1/10 UP/DOWN arrow buttons. Close the assignment feature
and save the UNIT number by pressing the 1/2 UP arrow button.