firelight; shadows or forms moving in firelight
「灯影」 has another reading with different meanings.
flicker of light
火影が壁に揺れる幻想的な夜だった。
It was a fantastical night with firelight flickering on the walls.
火影の中で彼女の顔が浮かんだ。
Her face appeared in the firelight.
キャンプの火影を眺めて過ごした。
I spent the time gazing at the campfire light.