How about lighting for 5 hours on the solstice in winter?

The daylighting time from winter solstice is 5 hours, which is a high standard daylighting time. In winter, the light is good for four hours, from noon 10 to 3 pm, so four or five hours is the highest temperature. At this time, lighting is good for the body and can make the body comfortable.

According to the national standard "Code for Planning and Design of Urban Residential Areas", the lighting of residential buildings meets the following standards: not less than 2 hours on cold days, not less than 1 hour from winter to Sunday. For the newly-built residence in the old district reconstruction project, the daylighting standard can be reduced as appropriate, but it should not be lower than the standard of 1 hour in severe cold days.

Factors affecting lighting

In most cities, it is best to buy a house facing south. According to the advantages and disadvantages of lighting, buyers should choose a house facing south > east > west > north.

It should be noted that the living room must face south and the master bedroom should also face south. Living room is the place where residents live and stay for the longest time; The master bedroom is a rest space and needs plenty of sunshine to ensure health. So the living room and master bedroom facing south are necessary.

Usually, the higher the floor, the less the house will be blocked by the surrounding buildings or other things, so the indoor lighting will be better and the sunshine time will be longer. However, a high floor is not good. Considering the severe sunshine in summer, the indoor temperature of high-rise residents will be higher than that of middle and low floors.