Essentially the title states my question. This question came to mind when i was reading up flash-bang grenades. I remembered an instance where a police officer had one of the pins on his flash-bang grenade get pulled accidentally and suffered severe burns upon detonation. he needed to be rushed to the hospital afterwords. I was wondering if it possible to create a very strong flash of light, such as that used by flash-bang grenades (sometimes exceeding 1 million candela) without generating such intense heat.