CSI - Episode 316 - Switching Flashlights
At 27 min 18 sec into the Episode Gil Grissom and Nick Stokes enter an old mine shaft, both carrying Surefire M4 Devestator flashlights. A few shots later at 28 min 03 sec they proceed further into the mine, but now they're both carrying Peak Beam Systems Maxa Beam Searchlights that have a totally different shape and beam than the M4s used before. A few seconds later at 28 min 16 sec they're both back to carrying the M4s.
CSI Season 3 DVD-Box