Ok so i have run about 7 meters of LED 50/50 strips around the kitchen and i seem to have a difference in power / light. i am aware of the drain that happens however being only 7 meters i think that should be plenty. only idea i have is to shorten the 2m strip that runs at the top of cabinets as its towards the end of that strip where it begins to get dim.
This is what i have used in the project
12V 6A 6 amp 72W DC POWER Supply