The present invention provides porous barrier compositions comprising color change indicators and methods of making and using the same. The light engine includes a circuit board that includes multiple LEDs for emitting light. The device further includes a magnetic field generation device included in the microfluidic grid and fluidic control circuitry coupled to the magnetic device to facilitate control of the magnetic field generation device to manipulate the droplet, when the droplet contains at least one magnetic bead, within the microfluidic channel. The LAS optical filter may be configured to prevent light having a wavelength outside a band pass region from reaching the photodetector and to pass light having a wavelength within the band pass region to the photodetector. In certain example embodiments, the coating or layer system has good corrosion resistance, good mechanical performance such as scratch resistance, andor good color stability ) upon heat treatment.