Optoelectronics

Performance Comparison of Two LED Downlight Designs ChromaLit™ Remote Phosphor Lighting System vs. Conventional White LED System

15th August 2011
ES Admin
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Conventionally, LED downlights implement white LEDs that are constructed of a blue LED device coated with phosphor. In the application, these LEDs are arranged in combination with a diffuser optic in order to perform with uniform luminance. This architecture is compared with a downlight designed with a ChromaLit™ remote phosphor light source converting the light emitted by an array of blue LEDs in a reflective mixing chamber. The blue LEDs in each system are controlled to be equivalent and both systems are designed to produce light of 3000K correlated color temperature (CCT) and 80CRI. The light output and luminous efficacy of both systems is compared under room temperature conditions with elevated system temperature during steady state operation.
Two LED downlight systems are assembled as shown in the table below. For the ChromaLit™
system, an array of blue LEDs emitting at 455nm wavelength is mounted on a printed circuit board
(PCB) which is mounted to a heat sink. Also attached to the PCB are a diffuse reflective sheet
(White97™ film from WhiteOptics) that closely surrounds the LED elements and a tapered walled
mixing chamber, also coated with reflective film. The reflective sheet used in this system has diffuse
reflectivity of 97%.

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