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LED Lighting Design Process (Part 1)
Date : 2009/10/13   Form : Eupple
Table 1 (below) lists a general process for designing high-power LEDs into a luminaire. The rest of the document walks through these design steps in order. To better illustrate these design concepts, this document includes example calculations for an LED luminaire meant to replace a 23-W CFL downlight. This design process is repeatable for all kinds of luminaires and not just the example included.
LED Lighting Design Process (Part 2)
Date : 2009/10/13   Form : Eupple
1. Define Lighting Requirements The LED luminaire must meet or exceed the lighting requirements for the target application. Therefore, the lighting requirements must be defined before establishing the design goals. For some applications, there are existing lighting standards that will define the requirements directly. For other applications, a good approach is to characterize an existing luminaire.
LED Lighting Design Process (Part 3)
Date : 2009/10/13   Form : Eupple
With the lighting requirements defined, the design goals for the LED luminaire can be set. Just as when defining the lighting requirements, the critical design goals will be related to light output and power consumption. Make sure to include other design goals that may also be important for the target application, including operating environment, bill-of-materials (BOM) cost, and lifetime.
LED Lighting Design Process (Part 4)
Date : 2009/10/13   Form : Eupple
Actual Lumens Needed With all the system efficiencies estimated, the actual number of LED lumens required to achieve the design goals can be calculated. For this calculation, only the light efficiencies (optical and thermal) are used. The electrical efficiency affects only the total power consumed and fixture efficacy, not the amount of light coming out of the luminaire. The calculation of “actual lumens needed” for the example luminaire is shown below:
LED Lighting Design Process (Part 5)
Date : 2009/10/13   Form : Eupple
With the number of LEDs calculated, consider all the possibilities to accomplish the design goals. Since each LED is a small light source and has a much longer lifetime than traditional light sources, LEDs can be integrated into luminaires with new and unusual design elements. Designers can take full advantage of LED light’s directionality and wide variety of available secondary optics to create original designs
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