Light sources for PP3/9V batteries

I'm writing a story and in it I mention that the light at the end of the tunnel when you die is actually a flashlight that takes nine-volt batteries. Is there any light source in the real-world I could use instead? My dialog is below:

I asked her as the train rattled on through the darkness outside, asked her what was behind the light.

“A big hand holding a flashlight,” She said with a laugh, and her nose crinkled with her happiness, “A big blue flashlight that, curiously enough, takes nine-volts.”

“Really now,” I commented interestedly.