Lighting apparatus comprising a light engine with a plurality of interconnection layers

Abstract

A LED based lighting apparatus is disclosed. The light engine used in the lighting apparatus may use printed circuit board and have a plurality of LED groups that are independently controllable by a control unit. The power supply input and return paths connected to each LED group may be implemented on different layers to allow a compact footprint that may be used with traditional fluorescent encasements with relatively little modification. The LEDs may comprise a subset of LEDs having a first colour and a subset of LEDs having a second colour different from said first colour intertwined on the light engine.

1 . A lighting apparatus comprising:
 a light engine comprising: a printed circuit board and an LED group on said printed circuit board coupled between a power supply input and a return path associated with said LED group; and   a power source comprising a power supply output coupled to said power supply input of said light engine and a power supply return coupled to said return path associated with said LED group.