Landing Lights

What are the guidelines or rules for use of an aircraft's landing lights. When should they be on? When should they be off? Do they vary from small GA to large a/c?

Landing lights should be switched on when entering the runway and kept on until reaching 10,000ft, then when descending the reverse applies ! Strobe lights are switched on when entering the runway and kept on until exiting the runway after completion of the flight, beacon is on at all times the engines are running and nav lights are on from start up to shut down!
Hope this helps !

Dont forget taxi lights, even though they are self explanitory!

Hey, we're talking about airplanes - not taxi cabs doh

He he

Landing lights stay on until after take-off (there's no 10,000ft rule... not sure when you got that from) and they go on before landing (usually when lined up on the final approach, maybe at about 5 miles out). They can be left on longer or put on earlier depending on whether it's a high-traffic area with poor visibility, or you want to scare away some birds that might be in the area, but they should not be on above 10,000ft (maybe that's where you got 10,000ft from).