Novel aqueous foamable concentrates are disclosed. Each of the substrates has a pair of alignment features, for example planar orthogonal surfaces or grooves in opposite sides of the substrate. without contamination of electrolytic solution, catalyst, etc. The LED additionally includes an attachment layer interposed between and configured to electrically connect the p-type GaN layer and the metal electrode layer, wherein the attachment layer comprises a transition metal oxide and is configured to transmit light emitted by the p-n junction and to transmit light reflected by the metal electrode layer. The thrust tube is operably connected with the nut, and the anti-rotation mechanism is attached to the thrust tube to substantially prevent rotation relative the housing.