A device configuration development system uses a common configuration and management database for the development of configuration and management data. Sample data is obtained that is representative of functioning of a patient’s heart for a plurality of consecutive beats, wherein each beat has a corresponding cycle length that may differ from cycle lengths of other beats. Additionally, the coolant, which is an inert compound, is used to separate the oxidizer and the fuel before the oxidizer and the fuel enter the combustion chamber eliminating the need for a complex inert turbo pump seal package. The light fixture further includes a light tray located in the cavity of the light fixture housing below the connection means.