A strong, high density foam glass tile having a small pore size which can be used as a facade on both exterior and interior building walls. A singular shield is positioned about a light source inside a housing. A request is received for processing by a web service instance. As the column selecting switches are in a hierarchical structure including the global column selecting switch that is directly controlled by the column selecting lines and the local column selecting switches that are controlled by the global column selecting switch, a load on the column selecting lines is reduced for high-speed operation. When the input voltage substantially equals or exceeds the predetermined voltage, the timer calculates duration of the interval time, the timer generates and transmits a switch signal to the first electronic switch when the timing is reached, and the first electronic switch is switched on by the switch signal and provides an output voltage.