The Blue Light was an accessory used by John Rambo to see in the dark. It was seen in Rambo III and was used in the escape sequences as well as some fight sequences in a cave.Peshwar, Pakistan, the de-facto headquarters of the Mujhadeen, where he meets Mousa, the leader of a rebel force. Mousa heads to the back room with Rambo to discuss the rescue mission. Rambo goes through his gear with Mousa and discusses his explosives and detonators. Mousa spots a plastic stick full of clear liquid and inquires what it is. Rambo grabs it and cracks it, and the clear liquid instantly becomes bright blue. Rambo responds that it is 'blue light' and a confused Mousa who thinks that it has a bigger purpose, asks what it is supposed to do. Rambo nonchalantly responds that it 'turns blue'. Mousa then realizes what it is supposed to do and says 'ah'. This scene has become somewhat of an inside joke between Rambo fans because of the way Rambo responded to what should have been common sense.
The blue light is first used by Rambo during the first escape attempt of the Soviet Camp when Rambo jumps into the sewer. Rambo cracks a blue glow stick and sees his way out. Rambo later uses it in a cave fight where he attaches the glow sticks to arrows and uses them to see him hit his targets as well as to see his way around the dark cave. Rambo also cleverly attached a glowstick to a grenade which a confused Spetsnaz commando picked up, only to arm the grenade and kill him.
- In 1997, Sylvester Stallone would again use blue light to see in New York City's collapsed underwater Holland Tunnel in his film "Daylight", undoubtedly a reference to Rambo III.
- "Blue light" is the only equipment named by Rambo but not given an actual name. It's just called "blue light". The technical name for "blue light" is a "glow stick" but that's a very general term.