Rapid prototyping of freeform optics for an LED downlighter with a dynamically adjustable beam

E. Juntunen*, P. Myöhänen, E. Tetri, O. Tapaninen, J. Ojalehto, V. Heikkinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

In this paper, an LED downlight producing dynamic beam variation without any mechanically moving parts is presented. The functionality is based on an optics design using compound parabolic concentrators equipped with individual LEDs. With suitable driving of the LEDs, a dynamic far-field beam with an adjustment range of between 16° and 55° is achieved. The luminaire is used as a demonstration of the polyurethane vacuum casting rapid manufacturing method to produce low-cost freeform optics for prototypes. The simulations and measurements on the realized prototype show that the method is suitable for small series and prototype manufacturing, but also reveal potential errors in the rapid manufacturing process to be avoided in the future.

Original languageEnglish
Pages (from-to)885-897
Number of pages13
JournalLighting Research and Technology
Volume48
Issue number7
DOIs
Publication statusPublished - 1 Nov 2016
MoE publication typeA1 Journal article-refereed

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    Juntunen, E., Myöhänen, P., Tetri, E., Tapaninen, O., Ojalehto, J., & Heikkinen, V. (2016). Rapid prototyping of freeform optics for an LED downlighter with a dynamically adjustable beam. Lighting Research and Technology, 48(7), 885-897. https://doi.org/10.1177/1477153515591390