Thanks, Ed. I thought my description was sufficient, but there's always what we call "Out of the mouths of babes."
Jeff, you're too clever for this business. You are absolutely correct: they are called lamps, so they must light up. I guess they should have been called "tubes."
However, if you read the BSP reference that I included in my first answer, you will read that if one is glowing, that indicates a fault. I guess the guy who engineered that particular installation hadn't read the BSP.
BTW, can you tell us (A) if there is any number(s) stamped on the brackets, and (B) what the specific application of these boxes were?
