Abstract: An emergency ballast for a compact fluorescent lamp including a heater disposed adjacent the battery for maintaining the battery at a safe and effective operating temperature during the time which the lamp is powered by the normal AC power supply. Additionally, the ballast includes a charging control circuit which precludes charging of the battery when normal AC power is supplied to the ballast charging circuit during the time when the battery is below a temperature for safe and effective charging. The output of the emergency ballast provides supplemental cathode heating to improve the operating performance of the compact lamp in severely low temperature emergency operation.

Abstract: An emergency ballast for a fluorescent lamp including a heater disposed adjacent the battery for maintaining the battery at a safe and effective operating temperature during the time which the lamp is powered by the normal AC power supply. Additionally, the ballast includes a charging control circuit which precludes charging of the battery when normal AC power is supplied to the ballast charging circuit during the time when the battery is below a temperature for safe and effective charging.

Abstract: An emergency ballast for a low profile fluorescent lamp fixture including an AC ballast including an end of lamp life shut down circuit. The emergency ballast includes a timing circuit which operates when AC power is restored to the lamp fixture after the fixture has operated for some period of time due to AC power failure. The timing circuit delays the application of AC power to the AC ballast for a given period of time (conveniently about 5 seconds) during the cessation of operation of the emergency ballast because of the restoration of AC power.