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The I-42-EM-R Fluorescent Emergency Ballast allows the same fixture to be used for both normal and emergency operation. In the event of a power failure, the I-42-EM-A switches to the emergency mode and operates one or two of the existing lamps for 90 minutes. The unit contains a battery, charger, and inverter circuit in a single can. The I-42-EM-R can be used with most 10W-42W twin, triple, quad tube, 2D & straight 4-Pin compact fluorescent lamps and 18W-36W long compact fluorescent lamps, with an initial output of up to 650 lumens for one or two lamps. The I-42-EM-A utilizes AC output to ensure compatibility with new lamp technologies, and features lamp selector leads for optimizing light output for designated lamp types. The I-42-EM-A provides 3/8" flex for wiring to the fixture ballast compartment and a single piece test switch and charge indicator for installation directly within the reflector (recommended for OEM installation only).