A lighting apparatus is provided. Surrounding the non-disordered quantum well active region is a disordered quantum well active region which prevents diffusion of injected carriers from the non-disordered quantum well active region or provides a lateral heterobarrier. When the kensington lock is inserted into the first kensington slot, this event is transmitted to inhibit the release of the engagement of the mounted portable computer, to enable its removal and to restrict the exchange of a PC card relative to the docking unit. During photolithography the anti-reflective layer suppresses undesirable reflections off of features, such as vertical sidewalls, that otherwise limit how closely to such features portions of the mask layer can be formed.