I cannot understand the reason for switching the landing light off at 300 ft after take off and then switching it on again in the Pre Landing Checks!
Isn't it because the aim is to actually teach departures and arrivals, and a circuit is just a fast way of doing that?
Same as a touch and go is a quick landing and a quick take off.
(There's already another discussion on here somewhere about how students should be taught full stop landings before touch and goes)
So if you just leave the light on, aren't you risking them forgetting to switch it off/on when really departing/arriving from an airfield.