Space planning: Evaluating natural light distribution in HDB flats (metrics)

Consider factors like window size, orientation, and obstructions. Use a light meter to measure illuminance levels in different areas.
Aim for 300-500 lux for general tasks and 500-1000 lux for reading or detailed work.
South-facing windows receive consistent sunlight, while north-facing windows provide diffused light. East-facing windows get morning sun, and west-facing windows get afternoon sun, which can cause glare and heat.
Daylight Factor (DF), illuminance levels (lux), and uniformity ratio are useful metrics. DF measures the percentage of outdoor light that reaches a point indoors.
Use light-colored paints, mirrors, and sheer curtains. Consider adding skylights or light tubes to bring in more natural light.