54.4: Zoomable LED Spot Light with High Angular Beam Sharpness | Zendy

Chiu HuanPing | Zendy; Chen KuanYu | Zendy; Cheng YaoChien | Zendy; Wang Alex | Zendy

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54.4: Zoomable LED Spot Light with High Angular Beam Sharpness

Author(s) -

Chiu HuanPing,

Chen KuanYu,

Cheng YaoChien,

Wang Alex

Publication year - 2011

Publication title -

sid symposium digest of technical papers

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.351

H-Index - 44

eISSN - 2168-0159

pISSN - 0097-966X

DOI - 10.1889/1.3621451

Subject(s) - illuminance , optics , beam (structure) , physics , metre , light beam , astronomy

A zoomable LED spot light with high angular beam sharpness has been made. The prototype is measured luminaire efficiency of 33.2%, total flux output of 4320 lm and central illuminance of 8940 lux at a distance of three meter. A qualitative definition as F/B ratio (F: field angle; B: beam angle) to evaluate the angular beam sharpness is proposed. The prototype has an F/B ratio of 1.35 compared to F/B ratio of 2 for the conventional low‐power LED spot lights. Finally, a novel design with in‐rod reflectors and a single integrator rod that has F/B ratio of 1.1 is also presented.

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