1 November 2005 Investigation of the spectral properties of LED-based MR16 bulbs for general illumination
Author Affiliations +
Optical Engineering, 44(11), 111310 (2005). doi:10.1117/1.2130314
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.
David Fitzhugh Brown, David B. Nicol, Ian T. Ferguson, "Investigation of the spectral properties of LED-based MR16 bulbs for general illumination," Optical Engineering 44(11), 111310 (1 November 2005). https://doi.org/10.1117/1.2130314


Lighting industry acceptance of solid state lighting
Proceedings of SPIE (January 26 2004)
Design of multichip LED module for lighting application
Proceedings of SPIE (November 26 2002)
Optical metrology for LEDs and solid state lighting
Proceedings of SPIE (February 10 2006)
Concepts for future solid state lighting solutions
Proceedings of SPIE (August 18 2010)

Back to Top