Abstract: A system to assess and prove the efficacy of one or more indoor air purification devices. Sensors to detect direct stimulus as to particulate and gas impurities, and collect and send the data collected from those sensors via a network to a computing device to analyze the sensor data and prove whether or not the purification devices are operating correctly. The system may also collect and analyze indirect stimulus data such as current, light intensity, temperature, humidity and air flow to prove or disprove efficacy of the purification device(s).

Abstract: A beacon or annular light generator assembly includes a top cover and an associated bottom cover centered on a vertical axis with a ring of light-emitting elements situated between the top and bottom covers. Upper and lower reflectors are integrated into the lower side of the top cover and into the upper side of the lower cover. These reflectors are surfaces of rotation, about the vertical axis, of a horizontal parabola whose focus lies substantially on the ring of light-emitting elements. A cylindrical collimating lens lies radially outside the ring of light-emitting elements, and concentrates the center portion of the light onto the horizontal plane. Light outside the center portion is redirected by the upper and lower reflectors parallel to the horizontal plane. A multiple array may be formed of two or more such annular light generator assemblies stacked upon one another.

Abstract: A beacon assembly for use as a marker on an elevated obstruction has a top cover and an associated bottom cover centered on a vertical axis with a ring of light-emitting elements situated between the top and bottom covers. Upper and lower reflectors are integrated into the lower side of the top cover and into the upper side of the lower cover. These reflectors are surfaces of rotation, about the vertical axis, of a horizontal parabola whose focus lies substantially on the ring of light-emitting elements. A cylindrical collimating lens lies radially outside the ring of light-emitting elements, and concentrates the center portion of the light onto the horizontal plane. Light outside the center portion is redirected by the upper and lower reflectors parallel to the horizontal plane. A twin-beacon version has a pair (or more) of these assemblies stacked one on the other.