Not exactly what they are looking for, they want to simulate a flashlight, not do a prop that looks like one. A prop cannot emulate a flashlight. A prop can only be made to look like a flashlight.
I found the solution.
You may want to do this solution by foxydash in order to emulate a flashlight:
If any of these help you, check 
which solution works best for you so that others can make a flashlight 