The invention relates to the soybean variety designated D4456885. The apparatus includes at least one AC to DC converter in communication with the impedance matching network. A generally concave unground intermediate surface is formed between the top surface and the chamfer surface, the intermediate surface at the transition to the top surface forming a second angle with the top surface that is greater than the first angle, and the width of the chamfer surface being greater than the width of the intermediate surface. The retainer is positioned such that the engagement between the retainer and the at least one of the troffer housing and the T-bar of the ceiling system is direct.