In this exercise you will go through some basic photometric measurements and observations of a daylit space with one or more work spaces with high and low visual comfort conditions. You may either pick several work spaces or visit the same work space at different times of day. If possible, all electric lighting should be switched off during your measurements. The exercise consists of three tasks described below. More details are provided in the notes section below.
1. Daylit Area Study A key architectural concept is to divide the floor plan of a building or space into a ‘daylit’ and a ‘non-daylit’ area. Within the daylit area, indoor illuminance levels due to natural light should be adequate, useful and balanced for most of the year. For this task you are asked to follow your own intuition and divide your sample space into a daylit and a non daylit area. In case you are working in a group, each member should conduct this part of the exercise independently. Please mark the two areas on the floor plan of the space and keep your assessment for the Daylight Availability Simulations exercise.
2. Photometric Measurements Identify work spaces with good and inadequate visual comfort conditions and briefly describe what is positive or negative in either case. Take a series of workplane illumiance measurements throughout the space and mark your results along with the date and time onto the floor-plan from task 1. Your illuminance measurements should capture the variety of daylighting levels throughout the space. Compare the border of your daylit area boundary to the typical target illuminance for daylit spaces of 300lux. Note down date, time and outside outside horizontal solar radiation during the time of your measurements. The latter you can often get from a local weather station.
3. HDR Photography: Record a set of calibrated HDR images of the work spaces from task 2 from the position of an occupant who is either visually comfortable or not. The images should capture the essence of what you earlier considered to be positive and problematic lighting attributes in the space. In case you wish to later build a calibrated model of your scene, you should also mark down date, time and a reading of the current outside solar radiation. For a glare analysis, you should also take an illuminance meter reading next to the camera lens facing the same way as the lens while taking the HDR photographs.