Abstract: A practice dummy for simulating a handgrenade or another explosive weapon includes a plurality of infrared light emitting diodes. A light signal from these diodes is used for simulating the explosion. The light signal can be received by suitable detectors, such that the effect of the dummy can be detected in practice combat. Similar practice dummies can also be produced for the simulation of other weapons, such as mines, mortar shells, etc. The dummy therefore allows a more realistic combat simulation for practice and instruction. The light signals emitted by the diodes can be adjusted to have a range similar to the explosion to be simulated. Such a dummy is easy to construct and compatible with existing optical simulation systems.