What is the definition of Primarily Light Particles?

"Primarily light particles" means tiny, ethereal beings that are so slimmer than a sugar cube they could fit on your finger tip, but still pack a punch in the form of electromagnetic radiation that can blind you with its brilliance.

---

Here's a bit of an edgy example sentence: "The cosmic ray's primary light particles, instead of causing a shower of rainbows, decided to play hide and seek with our unsuspecting brains."