Visible and UV lighting system
A lighting system combines an arrangement of UV LEDs which face a light exit window and an arrangement of visible light LEDs which face a reflector arrangement. The reflection can be used to provide desired beam shaping or diffusion so that beam shaping components are not needed at the exit window. In this way, UV deterioration of beam shaping components is avoided.
1. A lighting system, comprising:
a housing which comprises a support structure and a light exit window for emitting light to the ambient surroundings of the lighting system;
an arrangement of UV LEDs mounted on the support structure, wherein the UV LEDs directly face the light exit window;
an arrangement of visible light LEDs mounted on the support structure;
a reflector arrangement, wherein the visible light LEDs face the reflector arrangement, and the reflector arrangement is for reflecting the visible light output from the visible light LEDs to the exit window; and,
a UV beam shaping arrangement for shaping the output of the UV LEDs such that nearly all of the output of the UV LEDs passes to the light exit window without reaching any of the visible light LEDs.
2. The lighting system as claimed in claim 1 , wherein the UV beam shaping arrangement comprises a shaped part of the support structure.
3. The lighting system as claimed in claim 1 , wherein the UV beam shaping arrangement comprises a respective metallic shroud around each UV LED or around sets of UV LEDs.
4. The lighting system as claimed in claim 1 , wherein the UV beam shaping arrangement is adapted to direct at least 90% of the output of the UV LEDs directly to the exit window.
5. The lighting system as claimed in claim 1 , wherein at most 10% of the visible light output from the visible light LEDs directly reaches the light exit window.
6. The lighting system as claimed in claim 1 , wherein the housing defines a mixing chamber, with the UV LEDs at a top part and the light exit window at a bottom part.
7. The lighting system as claimed in claim 1 , wherein the light exit window comprises an empty opening formed in the housing.
8. The lighting system as claimed in claim 1 , wherein the light exit window has a solid transparent UV-resistant closure.
9. The lighting system as claimed in claim 1 , wherein the UV LEDs comprise UV-B LEDs and the visible light LEDs comprise white light LEDs or LED arrangements capable of delivering a white light output.
10. The lighting system as claimed in claim 1 , comprising an LED lamp selected from the group consisting of an LED reflector lamp, a tubular LED lamp, and an LED luminaire.
11. The lighting system as claimed in claim 6 , wherein the visible light LEDs face into the mixing chamber.
12. The lighting system as claimed in claim 6 , wherein the mixing chamber comprises one or more side wall portions and a top wall portion which forms the top part, wherein the visible light LEDs are mounted on the one or more side wall portions facing across the mixing chamber.
13. The lighting system as claimed in claim 6 , wherein the visible light LEDs are at the top part facing in the direction of the light exit window, and the reflector arrangement comprises reflector portions over the visible light LEDs to block the light path to the light exit window.
14. The lighting system as claimed in claim 11 , wherein the visible light LEDs are mounted on a rim around the light exit window facing the top part, directly or at an angle.