The good thing about a landing light on finals is, if you don't like what you see turn it off.
On the serious side landing lights and strobes left on in IMC at night can give you some very nasty illusions and back scatter that degrade your night vision. For Circuit OPS landing lights and or strobes great. IFR transit in IMC I dispense with the LL and Strobes (company policy) as IFR you have 1000 ft sep, 10 mins, and 10 nm lateral. In a radar env people can see you and hence see and avoid not really a factor until TOPD and terminal area.
Back in the terminal area and visual its time to be a Xmas tree again.
Night black hole apps in Summer, with the search and landing lights on grass hoppers and dust cause problems with keeping the landing aid visual and hence only turn the kit on to high light obstacles.
Max
