There is proposed an illuminating device, comprising (a) a luminous element, (b) a support, and (c) a primary optical element, characterized in that (i) said luminous element (a) is present on the support (b), and (ii) said primary optical element (c) is arranged on a composite of luminous element (a) and support (b) in such a way that it takes up, directs and emits the radiation emerging from the luminous element in the desired light distribution, wherein (iii) said primary optical element (c) is fabricated from a high refractive index glass and (iv) attached to the support by direct bonding.