Once you have understood the functionality and dynamics of the space, you can begin to develop a hierarchy which will help you to ‘spend’ your energy budget wisely. What do we mean by energy budget? Well, as you may be aware, projects in the UK are governed by Part L of the Building Regulations, and most countries will have a version of this. Depending on the type of project (domestic or commercial, new or refurbishment) there is either a percentage of installed light fittings which need to be deemed ‘energy efficient’, a watts per m2 figure averaged across the project, or a lumens per watt (a measure of emitted light vs energy consumed: all manufacturers have to provide this information about their products now). This forms your ‘Budget’ i.e. how much energy you have to play with.
Use your hierarchy to decide where to prioritise your energy spend. The more important an area or architectural element is, the greater a share of the energy budget it should attract. For example, allocate more energy budget to a reception area than a corridor.