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* T-8 approx 92% output at 14,000 hrs<ref>Green Energy Parks Partnership, "Lighting Retrofit Workbook", National Parks Service, Department of Energy, 2001</ref> | * T-8 approx 92% output at 14,000 hrs<ref>Green Energy Parks Partnership, "Lighting Retrofit Workbook", National Parks Service, Department of Energy, 2001</ref> | ||
== Ballast Considerations ( | == Ballast Considerations (T12 vs T8) == | ||
Most older T-12 lighting systems utilize a magnetic ballast. Conversely, newly installed systems (including T-8 retrofits) are run by an electronic high-frequency ballast. Electronic ballasts are more efficient than magnetic ballasts at converting input power to the required lamp power. Fluorescent lamps operating at higher frequencies reduce internal lamp losses resulting in an overall lamp-ballast efficacy increase of 15-20% compared to magnetically ballasted systems.<ref>Benya, James; Heschong, Lisa; McGowan, Terry; Miller, Naomi; Rubinstein, Francis; "Advanced Lighting Guidelines", New Buildings Institute Inc., California Energy Commission, 2003</ref> Other advantages gained by the use of electronic ballasts are: | Most older T-12 lighting systems utilize a magnetic ballast. Conversely, newly installed systems (including T-8 retrofits) are run by an electronic high-frequency ballast. Electronic ballasts are more efficient than magnetic ballasts at converting input power to the required lamp power. Fluorescent lamps operating at higher frequencies reduce internal lamp losses resulting in an overall lamp-ballast efficacy increase of 15-20% compared to magnetically ballasted systems.<ref>Benya, James; Heschong, Lisa; McGowan, Terry; Miller, Naomi; Rubinstein, Francis; "Advanced Lighting Guidelines", New Buildings Institute Inc., California Energy Commission, 2003</ref> Other advantages gained by the use of electronic ballasts are: |