[Denis]

The top two tanks share dual VHO ballast with Actinics plus two NO daylights from Home Depot on each. Bottom left just has 2 shop lights with 2 daylights and 2 03 Actinics. I'll be replacing this fixtures soon with waterproof sockets, just like the ones above. Last tank (bottom right) has 4 VHOs on IC660.
My logic behind the upper setup is that I reuse VHO actinics from my main reef upstairs and the daylights are cheap. Ultimately I'll replace dual VHO ballast with IC660 and share it among all 4 tanks. All bulbs are 4'.
Bottom right tank is 53"x35"x20", but will be replaced by 48"x24"x16" just like the others. For circulation from the sump I run Ampmaster 3000. This is completely separate system from my main reef system. Room was prewired for all the outlets (4 circuits), I hate extension cords and power bars.
Hope this helps.