In destiny, the term "light" is almost always used in one way:
In reference to a guardian's paracausal powers, which are created by a ghost filling a corpse with light, its not just philosophical, light is a real thing that pretty much turns guardians into living weapons
Similar to magicka in elder scrolls
[spoiler]theres a quote from cayde saying "void light shreds vex shields" in a quest step[/spoiler]
English
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Yes. This 'Light' you speak of should have a 'The' or a capital letter. Light itself(actual photons and rats reflecting off of surfaces) is a totally different thing.