A LED illumination device for stage lighting includes LED arrays packaged on a heat dissipating substrate and including a plurality of LED chips, a light combining device for combining the light emitted by respective LED arrays, and a focusing lens for focusing the combined light to a light output port. Trenches and contact vias are formed in insulating layers. The properties information may be provided to a portal and used by the portal to execute the portal entity. A synchronized clock is established between the first link aggregator and the second link aggregator. The correction may include the evaluation of an normalization or, in the feed back case, this can be implicitly included in the manner in which the iteration is applied.