Ultraviolet solar-blind cameras are used for inspection and research within the High Voltage domain. The current research in the field is compared with each other, considering image processing and radiometry (energy). From this comparison and research experience, the aspects for the relation between optical and electrical energy are identified. These aspects include Ultraviolet camera selection, characterization, calibration, saturation and processing. Furthermore, the electrical aspects also highlighted are test configurations, partial discharge, atmospheric conditions and test standards. Practical examples are presented.