Need more info. There are landscape transformers that can be set up that way but you also seem to have indoor loads - "stairs". How do you propose to get a photocell on that load? More common is an astronomic wall switch that knows when dusk is and can turn off at a preset time. Intermatic is one company that makes these.

Ron-bc-

We carry both photocells and timers for low voltage landscape lighting transformers. From your description (driveway, curbing, stairs) I am assuming you mean your outdoor low voltage landscape lighting (i.e. outdoor stairs). If this is the case you have a low voltage transformer mounted outside an out timers and photocells pull into the transformers. Our transformers are photocell/timer ready (built-in ports)--I don't know what kind of transformer you have.

With a timer and photocell you can have it turn on when it gets dark but always shut off at a preset time (like midnight) by the timer.

Another option is the new Atstronomic timer (you can get them at Lowes or Home Depot for about $29). They are digital timers that adjust automatically to changing sunset times and daylight savings times (you enter in your zip code or area code) -- this eliminates the need for a photocell, but unlike a mechanical timer it adjusts for changing sunset times (also has a battery back-up so you don't lose your programs from a power outage.

Below is a link to our photcells, timers and transformers.

Good Luck!

Here is a link that might be useful: landscape lighting transformers, timers, photocells