| 1938 | Dialight is founded to produce instrument panel light for aircraft and motor vehicles | |
| 1960 | Dialight is recognized as the North American leader in panel mount indicator products | |
| 1963 | Dialight becomes part of North American Philips | |
| 1971 | Just one year after the introduction of the LED, Dialight introduces it's CBI® (circuit board indicator) product | |
| 1980 | Dialight becomes a world leader in LED applications | |
| 1990 | Management buyout combines Dialight and other related companies into UK-based multinational Roxboro Group Ltd | |
| 1992 | Dialight becomes primary indicator supplier to the high growth networking market | |
| 1993 | Roxboro Group PLC successfully concludes initial public offering on London Stock Exchange | |
| 1994 | Dialight provides LED clearance marker lights for fleet-wide retrofit of New York City Buses | |
| 1995 | Dialight introduces the first AllnGaP LED traffic signal module | |
| 1996 | Dialight introduces the transit industry's most extensive line of LED signal and marker lights | |
| 1997 | Dialight announces the first hi-flux LED traffic signal with significant reduction in LED count and enhanced reliability | |
| 2000 | Dialight becomes the first FAA certified supplier of LED signals | |
| 2001 | Dialight receives FAA approval on L810 and L864 obstruction lights Dialight establishes assembly operations in Ensenada, Mexico Dialight becomes an Energy Star® Partner |
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| 2002 | Dialight establishes its European presence with the acquisition of Garufo in Germany | |
| 2003 | Dialight establishes its hi-flux design center in Farmingdale, NJ Dialight introduces its IntelliLED™ traffic signal |
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| 2004 | Dialight introduces its SpectraMix© LED Dynamic Color Control System Dialight obtains Class 1 Div 2 rating on L810 obstruction light |
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| 2005 | Wynn Resort opens with SpectraMix© controlled underwater fountain lights To focus investment on the rapidly emerging solid state lighting market, Dialight’s sister divisions of the Roxboro Group are spun off. The group is renamed Dialight Plc. (London Exchange listing is DIA) |