If it is a valid comparison, I have a Million Candle power light that I use in my boat. It also plugs into the cigarette lighter. Been using it for years and it never burned out the alternator in my ourboard motor, nor did it ever run the battery down. It also never blew the fuse. If those things did what you say I don't think they would be as popular as they are. If you are concerned about it, get one of the ones with an internal rechargable battery.

Pat