YOU SAID:

A lightbulb went off in his head when he put all the evidence together

INTO JAPANESE

彼がすべての証拠をまとめたとき、彼の頭の中で電球が消えました

BACK INTO ENGLISH

The light bulb went out in his head when he put together all the evidence

INTO JAPANESE

彼がすべての証拠をまとめたとき、電球は彼の頭の中で消えました

BACK INTO ENGLISH

The light bulb went out in his head when he put together all the evidence