The Radiant Set is an Armor set consisting of the Radiant Mask, Radiant Shirt, and Radiant Tights. All three pieces can be bought at the Gerudo Secret Club in Gerudo Town for 2400 Rupees and 9 Luminous Stones

Luminous Stones

Luminous Stones are primarily used to purchase and upgrade the Radiant Mask, Shirt and Tights set at the Gerudo Secret Club in Gerudo Town. The "Radiant" armor set are crafted with Luminous Stones to create their glow markings in the dark. They are also used for the side quest "Luminous Stone Gathering".

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in total after "The Secret Club's Secret" Side Quest has been completed.

What is the best armor in breath of the wild?

The best armour in Breath of the Wild is the Ancient set - the Ancient Helm, Cuirass, and Greaves - and is only obtainable after you complete a specific side quest - Robbie's Research - and you've then collected the right materials to be traded in at the Akkala Ancient Tech Lab.

What does the luminous stone armor do?

Luminous Stones are primarily used to purchase and upgrade the Radiant Mask, Shirt and Tights set at the Gerudo Secret Club in Gerudo Town. The "Radiant" armor set are crafted with Luminous Stones to create their glow markings in the dark. They are also used for the side quest "Luminous Stone Gathering".