At my last gig, a backyard party, I had my Mesa-Boogie TA-30 on the 15 watt setting, run through a Dr. Z Air Brake on 3. Everyone said that was about the right volume. And yes, it was mic'ed because the sound dog was recording the show.
I have an 18 watt Sommatone Slick 18, and it never goes past three, even on a live gig like yesterday, where we're working with a pro sound system and soundman. In a small room, it's lower. Past three and it'll blow your face off.
We play pretty loud. I use a Marshall 18 Watt head through a 2x12 or a 4x12, and I have it on about 9:00. I'd like an attenuator to limit some of the stage volume. It doesn't bother me, but I know it drives sound men crazy.
I'm the lead guy in a 5-piece with often two other guitarists. We don't always mic, depending on the gig. One of the rhythm guys plays a 100-watt DSL, the lead singer played a 100-watt JCM until about a year ago when he switched up to an AC30. To compete when we don't mic I have a 60-watt (and loud 60-watt) Blues Deville, but otherwise I run a 59 Bassman into a mic. Recently I picked up a Two Rock Studio Pro 35 and 410 cab, so I'm thinking of a 1-2 stereo punch of that and the Bassman.
We usually start at a reasonable level and as the night goes on it moves into the "too" loud category despite good intentions.
For this show: 1000 SS watts through a SansAmp RBI through two 410s with a Traben active bass, DI via SansAmp. 120 SS watt through a 412 with an Epi Les Paul, mic'ed with a 57. Drum kit close mic'ed, 12 in all. Piles of subs and stacks of tops. Of course this is an old video ( our first live with the current drummer) and we are much tighter these days. Plus the guitar/vocalist uses a 120 watt tube head with either one or two Marshall 412s ( v30s), still mic'ed with a 57 and I use an SVT/810 mic'ed with a P2 or an RE20 when I can get my hands on one and usually my 4001. Drums are the same except better mics. http://www.youtube.com/watch?v=xa3Sz3gjETI
Live I play a Kemper pretty loud. If I use an amp I am louder. It's 1 of the reasons I use a Kemper. It's balanced with the band but it's by no means buried in the background somewhere. My ears don't ring at the end of the night so I guess it's not that loud, but it is Rock and Roll...