29. Houses Must Have Yin Yang Balance

Your house should be designed to receive adequate sunshine and light. When houses are too dark, negative yin energy tends to build up with bad results. At night, lighting should also be adequate. At all times, the yin and yang energy must be well maintained. This means that when lights get excessively bright, it is also not a good idea. So at all times, be aware of the need for this vital balance.

Source: Lilian Too's 365 Feng Shui Tips