UV curing system for heat sensitive substances and process

A process for curing a target substance that is curable by exposure to UV light, the process comprising the steps of

• providing a UV curing system, the UV curing system comprising:
• a light source for producing UV light, the light source also producing non-useful light of frequencies other than UV,
• a shade member having a lamp-side surface that is situated between the light source and the target substance so that light from the light source does not directly strike the target substance, wherein the shade member performs dichroically to absorb heat-producing light that is not in the range of useful UV light, and wherein the shade member is made of a material with thermally insulating properties,
• a housing having an internal dichroic reflecting surface, wherein the shape of the internal dichroic reflecting surface of the housing, the shape of the shade member, and the location of the internal reflecting surface of the housing, the shade member and the light source with respect to each other are selected so that (1) at least some of the UV light that leaves the light source and travels in a direction in which it does not strike the shade member strikes the internal reflecting surface of the housing and is reflected onto the target substance and (2) at least some of the UV light that leaves the light source and travels in a direction in which it strikes the shade member is reflected from the outer surface of the shade member onto the internal reflecting surface of the housing, from which it is reflected onto the target substance, and
• activating the light source so that UV light strikes the target substance.