Press Release

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COLOR KINETICS SIGNS DIALIGHT AS NEW LICENSEE Boston, MA - June 20, 2006 - Color Kinetics Incorporated (NASDAQ: CLRK), a leading innovator of LED lighting systems and technologies, today announced that Dialight Corporation, the US subsidiary of UK-based Dialight plc (FTSE: DIA.L), will license Color Kinetics' full patent portfolio to support its LED application initiatives in the architectural, entertainment and general illumination markets. The worldwide license applies to sales of Dialight products in all markets covered by Color Kinetics' patent portfolio. The agreement also gives Color Kinetics access to Dialight patents as they may relate to enhancements to Color Kinetics' technology. Dialight specializes in the application of LED-based lighting technology and enables OEM partners to develop complete LED-based lighting solutions. Through its agreement with Color Kinetics, Dialight will now be able to offer its partners the unique features that are covered by Color Kinetics' patents -- complementing Dialight's SpectraMix® control system and associated intellectual property. "We're very pleased to support Dialight in its plans to enter new markets with intelligent LED lighting offerings," said Bill Sims, President and CEO, Color Kinetics. "We believe there are many market opportunities for this technology that will continue to grow through third-party product development. Our mission, in part, is to fuel that growth through licensing relationships built on our strong intellectual property." "We view this agreement with Color Kinetics as an important next step in driving forward our initiatives in the North American market for solid-state lighting," said Roy Burton, Group Chief Executive, Dialight plc. "We also believe this agreement will be a major factor in stimulating the adoption of LED technology by our OEM lighting fixture partners." About Color Kinetics Color Kinetics Incorporated (NASDAQ: CLRK) transforms environments through new, dynamic uses of light. Its award-winning lighting systems and technologies apply the benefits of LEDs as a highly efficient, long lasting, environmentally friendly, and inherently digital source of illumination - reinventing light itself as a highly controllable medium. Color Kinetics also enables widespread adoption of LED lighting through OEM and licensing partnerships in diverse markets. The company is headquartered in Boston, MA with offices in the UK, China, and Japan. More information is available at www.colorkinetics.com. About Dialight Dialight plc (FTSE: DIA.L) is one of the world's largest suppliers in the field of Applied LED Technology. It operates in two principal segments: Components where low brightness LEDs are used for status indication in electronic equipment; and Signals/Illumination which utilises the latest high brightness LED technology for Traffic and Rail Signals, Obstruction Lighting, Hazardous Location Lighting and for developing applications in more general illumination markets, including architectural and entertainment uses. Dialight plc has operations in the United Kingdom, Germany, the United States and Mexico. More information is available at: www.dialight.com. "Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding Color Kinetics Incorporated's business that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Readers are cautioned that these statements involve risks and uncertainties, are only predictions and may differ materially from actual future events and results. For a discussion of such risks and uncertainties, see "Risk Factors" in the Company's Annual Report on Form 10-K for the Twelve Months Ended December 31, 2005, File Number 000-50798, and most recent 10-Q, each as filed with the Securities and Exchange Commission. Contact Info
Felicia Spagnoli: fspagnoli@colorkinetics.com Media Relations Color Kinetics Incorporated 781-418-9292	Justine Alonzo: jalonzo@colorkinetics.com Investor Relations Color Kinetics Incorporated 781-418-9272