Abstract: An electrically-activated photoflash lamp which includes a glass envelope, combustion-supporting (e.g. oxygen) atmosphere, a quantity of filamentary combustible material (e.g. zirconium), and an ignition means including a pair of spaced leads sealed within the envelope and a primer mass for igniting the combustible material. The primer mass includes a first quantity of substantially non-ignitable primer material having a second quantity of highly ignitable primer material located thereon. Use of the first primer material permits pulsing of the lamp in air prior to application of the second primer material to thereby assure uniform ignition voltages between lamps similarly treated. A circuit utilizing a plurality of the above lamps and a method for producing said lamps are also disclosed.