What is the definition of Mainstream Light Particles?

Mainstream light particles, my friend, are the everyday cosmic rays that zip around our planet like they're on a mission to spread a little bit of sunshine, but with a side of existential dread. They're basically the light we'd expect from a typical, well-lit city street at night - a steady, bland glow that just might make you question your life choices.

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Edgy example sentence: "The main stream light particles of his mundane life flickered on, casting an unsettling glow that made him wonder if he'd rather be blinking at a neon sign or watching his reflection in a puddle."