The LP400 emergency ballast works in conjunction with a slim AC ballast to convert new or existing low profile fluorescent fixtures into unobtrusive emergency lighting. The emergency ballast consists of a high temperature nickel cadmium battery, charger and electronic circuitry in one compact case. The LP400 is for use with one 32 W 4 T8 fluorescent lamp. It is also compatible with most one , two , three and four lamp electronic, standard, energy saving and dimming AC ballasts. If used in an emergency only fixture, no AC ballast is necessary. The LP400 is suitable for indoor locations. It is not suitable for air handling heated air outlets or wet, damp or hazardous locations.