Patent ID: 7201494

Claim:
A lighting system capable of adjusting color temperature, comprising: a light source module for producing red-color, blue-color, and green-color lights so as to control a color temperature of a white light resulted from mixing said color lights; and a mixing assembly located at a side of said light source module producing a white light with a required color temperature by uniformly mixing said color lights after causing said color lights to undergo a plurality of reflections within said mixing assembly, said mixing assembly comprising: a first mixing device accepting said color lights from said light source module and causing said color lights to undergo a plurality of reflections before entering a second mixing device, said second mixing device accepting said color lights from said first mixing device and altering said color lights' paths to enter a third mixing device by causing said color lights to undergo a plurality of reflections, and said third mixing device accepting said color lights from said second mixing device and output said color lights after causing said color lights to undergo a plurality of reflections; wherein an incident light into an incident end of said first mixing device and an emitting light out of an emitting end of said third mixing device satisfy the following equations: sin 2 (θ in )×( w 11) 2 =sin 2 (θ out )×( w 22) 2 , w 22 =w 11+2×( h 1 +h 2)×tan β wherein, βis said first and said third mixing devices' wall inclination angle, w 11 is said incident end's aperture of said first mixing device, w 22 is said emitting end's aperture of said third mixing device, h 1 is said first mixing device's height, h 2 is said third mixing device's height, θ in is said incident light's incident angle, and θ out is said emitting light's emitting angle.