A dynamic hysteresis comparator has a threshold voltage level with dynamic hysteresis for sensing small changes in differential input signals at the input, while controlling a duration that an output voltage state will remain fixed for preventing the output of the comparator from changing state in an unstable fashion or \u201cchattering\u201d. The valve assembly is opened by insertion of the luer tip of the syringe into the assembly inlet. A first trench is created in the substrate adjacent to the gate structure through the use of a first etch. The kaolin can also have a particle size distribution wherein at least about 99% of the particles by weight have an esd of less than about 2 \u03bcm, andor wherein at least about 98% of the particles by weight have an esd of less than about 1 \u03bcm, andor wherein at least about 97% of the particles by weight have an esd of less than about 0. The reservoir is laterally offset with respect to the tubular body and has at least a portion thereof below the upper end of the tubular body. In an aspect, a semiconductor wafer is provided that includes a plurality of LED dies wherein at least one die includes an electrical contact, a photo-resist post covering the electrical contact, and a phosphor deposition layer covering the semiconductor wafer and surrounding the photo-resist post.