Why do some Dash-8s have landing lights on the nose?

Question

In regards to the deHavilland DHC-8, I've noticed that some have landing lights on the nose in addition to the on wing landing lights... why is this? is this an older model feature?

thanks for the info on the taxi vs. landing light situation. I guess I should have been more clear though... Now that I know they're taxi lights, why is it that some dashes have them on the nose wheel strut, and some like the one here (http://www.airliners.net/open.file/1205956/L/) have them within the nose cone?

Answer 1

The wing lights focus on distance, such as down the runway, while the nose lights focus on the ground, close to the aircraft.
The wing lights are useful for landing and takeoff, while the nose light is more useful for taxiing.

Answer 2

Ted is right - the lights on the nosewheel strut are "taxi lights". Landing lights are in the wings.
I am afraid I have no idea just what models have or have no taxi lights.