Light Penalty

[SWAFO]

Normally, we'll only turn the landing lights, strobes, and possibly the runway turnoff lights on when we're cleared for takeoff. This way, the
tower and other aircraft clearly know what everyone is doing. If there's an aircraft on close final, and see's a 747 entering the runway with
his strobes on, he know's he's in trouble and needs to go-around. It's a simple, yet helpful practice.

The taxi lights are operated at the pilot's discretion. Some like to keep them on during the takeoff, others will turn them off before takeoff.

Normally, I'll keep the taxi lights on until the after takeoff checklist is complete. On the descent, when passing FL180 I'll flip on the landing
and taxi lights (and runway turnoff if it's night time). During a night time takeoff, I'll use the landing, RT, and taxi lights, and flip the taxi
lights off after takeoff, and the LL and RT off at FL180.

Hope this answers your question.