Flick (physics)

In optical engineering and telecommunications engineering, the flick is a unit of spectral radiance. One flick corresponds to a spectral radiance of 1 watt per steradian per square centimeter of surface per micrometer of span in wavelength (W·sr⁻¹·cm⁻²·μm⁻¹). This is equivalent to 10¹⁰ watts per steradian per cubic meter (W·sr⁻¹·m⁻³). In practice, spectral radiance is typically measured in microflicks (10⁻⁶ flicks). One microflick is equivalent to 10 kilowatts per steradian per cubic meter (kW·sr⁻¹·m⁻³).