This is a very good book. The text provided is very helpful and the layout is easy to follow, no vague suggestions. The pictures are useful to illustrate the points but I think they could have been better. We are having our hous built, and we have lighting plan as part of the whole working plan and we thought it was fine, but then after reading this book we learnt how to do it more professionally and are making major changes-- and we are making them very confidently! One thing that the book needs to add in, in future versions, is about the calcuations of light needed as per room type and per space. Giving a rough idea of acceptable ranges would have been appreciated.