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Title: A study of the spatial intensity distribution of LED for general lighting
Authors: Chung, TM
Dai, SS
Issue Date: 2009
Publisher: Znack Publishing House
Source: Light and engineering, 2009, v. 17, no. 4, p. 84-91 How to cite?
Journal: Light and engineering 
Abstract: The luminous intensity spatial distribution (LISD) of LED (Light Emitting Diode) can be categorised into two broad types: lambertian type LISD and batwing type LISD. Each type has its own specific characteristics and advantages. By considering each single LED as a point batwing emitter, we analyse in this paper the fi rst order design of a luminaire consisting of several LEDs assembled upon a planar surface to be applied in uniformly illuminating applications such as general lighting. By simulation and fi rst order calculation, we analyse the impact on the illuminance uniformity by different batwing parameters (paramount angle, centre versus paramount intensity ratio) and present the experienced optimised batwing design parameters for uniform general lighting application based on the LEDs luminaire mounting height and the LED-to-LED spacing in different luminaire packaging (string luminaire, ring luminaire, matrix luminaire, etc.).
ISSN: 0236-2945
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