My focus is on sound. I am a live sound production company. I do not rent. Period. I say this only because people get their noses bent out of joint when they can't rent my gear. Why I don't rent is because the rental mentality is "take it, break it, return it, done". While not 100% true, it's unfortunately more true than false.
I've gotten a LOT more lights since October of 2005. How would I set it up?
First off, I have to get over some technical issues, which would involve mixing and matching some parts, but that's my problem.
I'd start with the 15-foot truss on the front of the stage, heavily populated, mainly since this would have more of the dance lights on it, as well as plenty of Par38's. This is how I did the October 1, 2005 event. I also had a 10-foot truss on each side of the stage, populated with Par38's and some of my smaller dance lights to project through the stage to give some stage random color and motion. On the back of those trusses, I ran the T-bars to try to get some rear stage ambience and depth.
On the ground in front of the stage I put my 2 5-foot I-beam sections and put some Par38's(un-gel'ed) for some foot lighting.
Unfortunately, the promoter gave me 1 15-amp circuit, and I was popping it all night long since I was refused additional circuits. I also didn't get power to house until an hour before event since the flunky with the generator was shmoozing on the talent instead of doing their job. I had a great light show planned, and I had it taken from me.
Now, back to my live sound focus: I'll throw in the lights for free, that's how much I care about sound. Hire me for sound, get free lights. I stress hard over getting perfect sound, and really, lights are not in my top 5 list of concerns for me, as I'm supposed to have crew dealing with my lights for me while I deal with sound.
In your case, just bring the lights. If people just want music, once they realize the place is either too dark or too light or there is no atmosphere outside what the party itself brings, they'll realize they should have had lights. Price your stuff as you want, but I'd suggest you always bring lights, you'll get more work. I agree that as your businesss expands, your gear should increase, as will your set-up time and your rates. Scale up and down and price accordingly.