I teach that the landing light, strobes and nav lights go on immediately prior to entering the runway for take-off. They stay on in the interests of conspicuity for the entire sortie and are switched off as part of the after-landing checks.
If I remember correctly we did this on the VGS Vigilants on the back of an RAF study some years ago that leaving the LL on reduced the risk of birdstrike by a significant percentage. Presumably every little increase in conspicuity helps, and LED landing-lamp bulbs last a lot longer than incandescents.