In a controlled trial , 88 patients ( 310 AK lesions ) received ALA-PDT in combination with either visible light ( VIS ) + water-filtered infrared A ( wIRA ) light ( PhotoDyn ( ) 750 ( PD750 ) , 580-1400nm ) for 30 min or incoherent light ( Waldmann ( ) 1200L ( Wa1200L ) , 600-720nm ) for 10-11 min .