To perform thread-based message prioritization, metadata may be extracted from a received electronic message. The pixel unit comprises a data line, a gate line and a pixel electrode formed on a base substrate. At least one of bonds between a germanium atom and oxygen atoms has a bond energy higher than at least one of bonds between a tin atom and oxygen atoms or a gallium atom and oxygen atoms. The luminaire may further include a secondary optic positioned adjacent to the light source that may collimate andor refract light emitted by the light source, and may form a seal between the light source and the optical chamber. The imaging unit is configured for modulating light from the light source with image information.