This is only my opinion. NO single HPS light grower + a shoplight fluoro for keeping clones with the normal accessories that go along with that single light such as 1 big inline fan that can perform double duty pulling air thru a carbon filter and blowing it thru an air-cooled reflector and a small fan to circulate air thru the plants shouldn't alert any red flags.
Some even say if you have a 3 bedroom house, you can figure running 3 -1000's plus accessories and still be under the radar at attracting attention but I disagree with that. I still stand by the single light HPS, plus fluoros for clones, with accessories and you should be fine.
If this is for personal grow needs, then all you need is a single HPS light and fluoros just enough for vegging/clones with the normal accessories for that personal grow. Run your single HPS light at night and off in the day to minimize the need for air conditioning. Even if you still need the air conditioning at night for cooling, you still save money compared to trying to keep your grow cool by burning the HPS during the day.
When I first started growing I ran a single 400 HPS for flower and would pull anywhere from a tad over 10 ounces to just under 12 ounces dry weight. I lived in Georgia at this time and I never had any visits or letters, but then again I lived on 30 acres in a thickly wooded area behind a locked gate off the road and the double-wide trailer I lived in could not be seen from the road for the trees ,there was about 400 yrd between the mailbox and my front door. I done this for 3 years there and no one ever knew about it. Electric bill was always paid on time.
I stepped down to a single 250 HPS since moving to Colorado in 2009 , as I do not run an air conditioner. Was verbally promised by the overseer of the property that I could run my window unit but the bastard renegged after I moved in. That's another story, but the reason why I stepped down to a 250 HPS.
Anyway, if this is for a personal supply, I don't see how a single 600 HPS for example with accessories could draw any electric companies attention. Florida would probably be the worst state in my opinion for snooping authorities when it comes to growing.
Smart Meters for example, now these technological devices have some invasive privacy concerns that I do not like, in addition to ill health effects. Where I live I have the old analog meter. This is a good video on Smart Meters and could present problems for growers, ESPECIALLY in non-MMJ states.
[video=youtube;FLeCTaSG2-U]http://www.youtube.com/watch?v=FLeCTaSG2-U[/video]