What is the effect of ambient temperature on plasma lighting systems?
Operating the plasma lighting systems in hotter ambient environments will decrease light output and increase CCT. LUXIM's LiFi STA 41 01 Data and Reliability Package states that there is a 3% decrease in light output and a 100 K increase in CCT at 50°C relative to the light output and CCT measured at 20°C (LUXIM 2010c). The publication states that the decrease in light output is due to a decrease in the RF driver efficiency, and the shift in color temperature is due to a decrease in the bulb wall temperature at the cold spot; the same publication also claims that light output will increase by approximately 7% at -40°C relative to the light output measured at 20°C and that the color shift is less than 20 K for temperature ranges between -40°C and 20°C (LUXIM 2010c). Hollingsworth (2012) showed that light output decreased by a maximum of approximately 3% for a Topanga plasma lighting system operated in a temperature range of 40°C to 55°C. Hollingsworth (2012) also indicated that there was no reduction in light output at temperatures between -30°C to 40°C and that operating this plasma lighting system at -40°C would decrease light output by approximately 3%. Verifying temperature effects on plasma lighting systems was beyond the scope of this NLPIP study.