LED lighting with adjustable temperature

Abstract

The invention relates to the technical field of semiconductor lighting, specifically to a lighting device. The color temperature-adjustable LED lighting device comprises at least two white light LED lamps with different color temperatures, and a half-transmitting and half-reflecting lens group, wherein the half-transmitting half-reflecting lens group comprises at least two half-transmitting half-reflective lenses. The emergent rays of the two LED lamps are combined into one beam of synthetic light through one of the half-transmitting half-reflecting lenses. The color temperature-adjustable LED lighting device further comprises a half-transmitting half-reflecting lens switching mechanism. Switching of the at least two half-transmitting half-reflecting lenses of the half-transmitting and half-reflecting lens group is carried out through the half-transmitting half-reflecting lens switching mechanism, such that the synthetic effect of the emergent rays of the two LED lamps can be adjusted. Owing to the above technical scheme, the color temperature-adjustable LED lighting device of invention has outstanding advantages of simple manufacture, low cost, large scope of lighting brightness adjustment, simple and accurate color temperature adjustment, good coloration, long service life, low energy consumption, instant lighting, etc.

Description

technical field [0001] The invention relates to the technical field of semiconductor lighting, in particular to a lighting device. Background technique [0002] With the development of semiconductor lighting technology, the application of white LED is more and more extensive. At present, white light LEDs generally add phosphor powder on the blue LED chip. Part of the blue light is absorbed by the phosphor powder, and the phosphor powder is excited to emit yellow light. The emitted yellow light is mixed with the remaining blue light, and various color temperatures can be obtained by adjusting their intensity ratio. of white LEDs. However, the color temperature of this white LED cannot be adjusted after the chip is formed. There are generally two types of color temperature control technologies for white LEDs commonly used by people: 1. By packaging multiple LEDs of different types in one plane, it is realized by changing the luminance of different LEDs. The disadvantage of ...

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Problems solved by technology

The disadvantage of this method is that it usually sacrifices the maximum luminous brightness of a certain LED or a certain group of LEDs to achieve adjustment, which will reduce the maximum luminous brightness of the system, and the control is complicated and inaccurate. At the same time, this method increases the LED luminous area. In the design of the lighting path, it is almost impossible to reduce the area and angle of the converging spot; 2. Use two-primary-color LEDs, RGB three-primary-color or multi-primary-color LEDs to combine light through a vertical optical system

The disadvantage of this method is that the system is complicated, and it is also necessary to adjust the luminous brightness of different particle LEDs, which will reduce the maximum luminous brightness of the system, and the control is complicated and imprecise.

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