The following information is useful when choosing an emergency conversion module: 1. Luminaire Input Power, 2. Emergency Output Factor (EOF) when driving an entire LED array, 3. LED parameters of the luminaire and 4. Luminous flux (lumens) required in emergency operation. It is likely that you will not have all of this information so, this handy calculator will help you in choosing the most appropriate product for your needs, based on the information you have available. The more information you input, the more accurate your calculation will be. Simple!