There is a iodin gallium lamp preheating process warming phase of the luminous intensity of the lampdimming was too low to preheat phase print, there is not enough exposure occurs. 碘镓灯有一个预热历程，预热阶段的的灯管不收平强量很矮，预热阶段晒版会不入现曝平不敷的本体。
a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)