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

• 光化光: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。照相制版时，用作硬化版面材料。