So I recently started flying the 1900 again in anticipation of the release of the v4 js41...except i have a weird issue where the landing lights dont really seem to work right as you can see in the attached picture. p3dv4.1 active sky, orbx, pta yadda yadda

Looks like Carenado's custom landing light texture to me.  Yes, there have been complaints that their landing and taxi lights do not do a particularly good job of illuminating the ground, but it is not something that can be changed as it is coded into the aircraft model file.