3 August 2016 High-flux focusable color-tunable and efficient white-light-emitting diode light engine for stage lighting
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A color mixing light-emitting diode (LED) light engine that can replace 2-kW halogen–Fresnel spotlight with high-luminous flux in excess of 20,000 lm is reported for applications in professional stage and studio lighting. The light engine focuses and mixes the light from 210 LEDs of five different colors through a microlens array (MA) at the gate of Ø50  mm. Hence, it produces homogeneous color-mixed tunable white light from 3000 to 6000 K that can be adjustable from flood to spot position providing 10% translational loss, whereas the corresponding loss from the halogen–Fresnel spotlight is 37%. The design, simulation, and optimization of the light engine is described and compared to the experimental characterization of a prototype. The light engine is optimized through the simulated design of reflector, total internal reflection lens, and MA, as well as the number of LEDs. An optical efficiency of 59% and a luminous efficacy of 33  lm/W are achieved, which is three times higher than the 2-kW halogen–Fresnel spotlight. In addition to having color rendering of color rendering index Ra > 85 and television lighting consistency index 12 > 70, the dimmable and tunable white light can be color controlled during the operational time.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Maumita Chakrabarti, Maumita Chakrabarti, Henrik Chresten Pedersen, Henrik Chresten Pedersen, Paul M. Petersen, Paul M. Petersen, Christian Poulsen, Christian Poulsen, Peter B. Poulsen, Peter B. Poulsen, Carsten Dam-Hansen, Carsten Dam-Hansen, } "High-flux focusable color-tunable and efficient white-light-emitting diode light engine for stage lighting," Optical Engineering 55(8), 085101 (3 August 2016). https://doi.org/10.1117/1.OE.55.8.085101 . Submission:


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