Actually, there are certain regulations regarding candles in public buildings because of fire laws and insurance requirements.
After cigarettes/lighters, unattended candles are the most common cause of fires.
My experience with JWs shows that decorative candles at home are common. I'm sure many of Bill Bowen's customers were JWs.
There might be some bizarre Pharisaical JWs in some congregations who feel candles at home are demonic, etc. But I just feel it is their sad little way of getting attention or feeling special.
I have seen candles on dining room tables, on coffee tables and entryways, and a new way is to use a large candelabra with candles by the fireplace.
Just remember, the most dangerous aspect of using candles is to light them and then walk out of the room or worst yet, leave home forgetting to extinguish them.