Patent ID: 8461613

Claim:
A light emitting device comprising: a plurality of light emitting diodes on an insulating substrate having an array of recesses and walls; a phosphor containing layer overlying the insulating substrate to cover the recesses and walls of the insulating substrate without contacting the plurality of light emitting diodes, said phosphor containing layer being substantially uniform and having at least one phosphor material being operable to absorb at least a part of the light emitted by the light emitting diodes and to re-emit light of a different wavelength; wherein each recess houses one of the light emitting diodes so that the one of the light emitting diodes is fully received within the recess and not protruding from a surface of the insulating substrate; wherein the light emitting diode housed in each recess emits light from within the recess; wherein the substrate incorporates a pattern of electrical conductors configured for connecting the light emitting diodes in a. selected electrical configuration and to provide at least two electrical connections on the floor of each recess; wherein each light, emitting diode is connected to the at least two electrical connections; wherein the device further comprises a rectifier arrangement for enabling the light emitting diodes to be operated directly from an AC supply; wherein components of the rectifier arrangement are housed in one or more recesses; wherein the rectifier arrangement comprises four diodes connected in a bridge rectifier configuration and wherein the pattern of electrical conductors is configured such that the light emitting diodes are connected in series between the rectifying nodes of the bridge; and wherein the walls are substantially perpendicular to the plane of the substrate.