If you're input model is a jmf, this will be ignored. You should specify the lighting you want during the original model reading (ie before conversion).
It is usually better to use default lighting associated with ModelReaderSettings.lightingSmoothAngle (use 30 or any other value which fit best).
One thing to note, dynamic lighting is very intensive on android devices. If you have full control of your data workflow (model creation), it would be better to have a lightmap (pre-computed lighting) and no dynamic lights.
