If your design permits, natural lighting is always going to be preferable. If this isn't possible a low energy, non heat producing LED light will work. Phillips Hue can produce adaptable lighting that can be easier on the eyes for long sessions. Be careful as some lighting may also produce an audible hum that will be picked up by the microphone. Ideally you want a direct source of clean power in to the studio. An incorrect power supply can cause interference with the recording equipment. If you experience any problems a power conditioning unit can solve the problem. Additionally, after all the effort you have gone through to soundproof your studio you will need to ensure no air gaps surround the cables that are entering your booth. Rubber or foam seals will easily solve this problem.