We have used climate based daylight modelling and it certainly does supply some information which the average daylight factor alone does not. However, during the early stages of design, when the architect may want to get a feel for window size and orientation, CBDM may be excessive. A sunlight study plus a daylight factor plot give the design team the information they need to make decisions but in a fraction of the time and in a very tangible format.
For use in the initial design phase, we are developing a simulation technique that graphically conveys the probability of electric lighting being used based on the average daylight factor. The same model can then be used to make a quick prediction of the likely energy implications without resorting to a full dynamic thermal model.