A method for calculating a primary time constant of a power grid. In some embodiments, the invention features integrated circuitry to each of the LEDs that affords accurate control of emulation of light emission of fire flies, or other light sources in some embodiments, such as timing, duration, delay, decay, ramping and fade emission control. A strained channel transistor 132 is formed in the second active region. The anchors may be carried by a peripheral portion of the support structure, or by a central portion of the support structure.