I went to a few "candlelight" meetings, and yes, they were actually in candlelight. It wasn't much different than a normal meeting, except it was....with the darkness, it was like I didn't feel so "exposed". It was pretty cool.
Now, I'm an RA (recovering addict) and my meeting was NA, but I would assume the same would apply to al-anon. I'm also a recovering codie, so I think it would be worth checking out.
Hugs and prayers,
Amy