Celebrating Solstice
Open the Details screen on any piece of Sunlit armor, and add the Kindling under armor mods.
Doing so will allow you to spend Silver Ash to imbue the armor with Embers that improve it.
You can feel the heat emanating from your Sunlit armor. If you were to add Kindling to it, it would certainly have an effect.
"With some Kindling and some Silver Ash, who knows what you could reignite?" —Eva Levante