The present invention relates to a multibeam exposure head having a multibeam light source which exposes a recording material by main scanning. Use of unpigmented acrylic modified fluoropolymers to form powder coating and objects so coated are also disclosed. In other embodiments, remote dispersion compensation is performed and Raman amplification is provided to overcome at least a portion of the loss. A controller determines added mass on the vehicle in response to the signal and adjusts a vehicle characteristic in response to the added mass.