Good-Lite Neutral Density Bar SlideGood Lite Neutral Density Bar Slide Will add 1. 8 density to filter bar. Good Lite: Good Lite is a leading supplier of precision optical instruments and lighting products. They have been in business for over 30 years and are committed to providing high quality products and excellent customer service. Good Lite is an authority in the product category and is trusted by technicians and engineers around the world.