Define Design Goals for LED Lighting

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.

Characteristic Unit Goal Notes
Light output lm 810
Illuminance distribution fc Same shape as target; matching or better illuminance
Power (excluding driver) W 23
Efficacy lm/W 35
Lifetime hours 50,000
Correlated Colour Temperature (CCT) K 4,000
CRI 75
Circular opening in 6
Maximum ambient temp. °C 55 Commercial building with vented ceilings
High volume BOM cost US $50

Table 4 - Design Goals for CFL Downlight Replacement Luminaire

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