Rockets that use electronics, such as an altimeter or timer, to deploy the recovery system need igniters to ignite the black powder ejection charge. Desired characteristics of an ejection charge igniter are listed below.
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Supply of fireworks material: require low current to fire so that it can be used with
common rocketry electronics. Most motor igniters require far more current
than rocketry electronics can deliver to an igniter.
A short burn with little flame - long enough to ignite the ejection charge
but not too long to ignite the recovery system or airframe.
Reliable supply
Most rocket motor igniters are high current igniters, and will not work
with most rocketry electronics. Motor igniters are designed to produce
a large fireball for a long period of time (1/2 - 1 second), which is
not desireable inside a rocket's airframe. Igniters acceptable as ejection
charge ignition are listed below. (Electrical igniters are also sometimes
called electric matches.)
The supply list does not include photographic flashbulbs. The author does not believe that flashbulbs are acceptable as ejection charge igniters due to questions of reliability and accidental firing.
Feerie is a company that manufactures igniters for consumer products, supply for fireworks industry. They are also used by the fireworks display industry. The igniters are very reliable.