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Optical Engineering

Investigation of the spectral properties of LED-based MR16 bulbs for general illumination
Author(s): David Fitzhugh Brown; David B. Nicol; Ian T. Ferguson
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Paper Abstract

The spectral properties of commercially available halogen and LED-based MR16s were investigated. The metrics used to characterize the MR16s include the total luminous flux (TLF), correlated color temperature (CCT), color-rendering index (CRI), angular variation of CCT, and luminous efficacy. The halogen MR16s were included as a baseline for comparison with LED-based MR16s. Seven LED-based MR16s were investigated, including three constructed from 5-mm LEDs, and four constructed from high-power devices based on a larger die. It is shown that MR16s constructed from white LEDs are not suitable as a direct replacement for existing alternatives at this time, due to their low power efficiency and poor TLF. MR16s constructed with a single phosphor also have poor CRIs and undesirable CCTs. An MR16 with an extra phosphor in the red region of the spectrum shows improvement in CRI and a lower CCT than the other LED-based MR16s. All of the LED-based MR16s had a variation of CCT that was larger than those of the halogen devices.

Paper Details

Date Published: 1 November 2005
PDF: 4 pages
Opt. Eng. 44(11) 111310 doi: 10.1117/1.2130314
Published in: Optical Engineering Volume 44, Issue 11
Show Author Affiliations
David Fitzhugh Brown, Georgia Institute of Technology (United States)
David B. Nicol, Georgia Institute of Technology (United States)
Ian T. Ferguson, Georgia Institute of Technology (United States)

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