I used to have two 400W equivalent CFL light bulbs under a light hood/reflector. The two lights consumed about 128W.
A few months ago, I switched over to a single LED light. Not your everyday LED, but a COB led array (Cree CXA 3070). This is what is lighting the juniper in my pics from this morning. The light consumes 96W.
My lights run 16 hours a day normally, but I've also ran them 24/7 for several weeks at a time. I only switch back to 16 hours a day due to the ~$40/month extra on my electricity bill.
Misters/sprayers? Nope. I put them in a ebb and flow hydroponic setup since day 1. My fert is a commercial cucumber one that is 4-18-36 (http://www.hydro-gardens.com/81636....th for a single lamp with your electric rates