In Iron Man (2008) the source of the beam of light is at Stark Enterprises where Tony has unlocked and powered on his first beacon shortly after defeating a wither in Minecraft. :
How to Set Up a Beacon in Minecraft
How to Craft and Use a Beacon in Minecraft
Beacon – Minecraft Wiki
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Halo: beam tower Minecraft Map
Minecraft: how to make and activate a Beacon | Rock Paper Shotgun
So, the new beacon beam sort of sucks. - Future Updates - Archive - Minecraft Forum - Minecraft Forum
A Sideways Beacon in Minecraft! - YouTube
Minecraft: how to make and activate a Beacon | Rock Paper Shotgun
Minecraft - How to make an epic beam of light! - YouTube
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How to make a Minecraft beacon | PCGamesN
Beacons | Minecraft 101
What's up with the giant beam of light? : r/Sacramento