A server rack holds a number of modular servers configured for liquid cooling by passing a liquid coolant through interiors of the servers. This photosensor includes a light-modifier located between the photosensor and a target area to be monitored by the photosensor, wherein the light-modifier provides a customizable angular response for light received at the photosensor from the target area. The organic diluent has a boiling point higher than a eutectic point in a phase diagram of the first and second metals. The mask may assist the priority arbitration scheme to assign priority to the plurality of requestors by temporarily removing a subset of the plurality of requestors for a particular priority assignment period. Each of the low power path and the high power path includes impedance matching networks and power amplifiers.