Actinic light Chemically active light from are lamps, mercury vapour lamps, photo-flood bulbs (gas filled tungsten filament incandescent lamps), to harden light-sensitive plate coating.

• 引起化学作用的光。由弧光灯,水银蒸气灯,溢光灯(钨丝充气白热灯)所发出的光。照相製版时,用作硬化版面材料。