St Johns College Student Hub, Cambridge


KJ Tait Engineers were appointed by St Johns College to carry out an assessment on how to increase the daylight levels within the student hub.

The assessment included:

Average Daylight Factor (ADF) to all other occupied spaces in accordance with Lighting Guide 5 (LG5).

Key Outcome:

The aim was to work closely with the Architect on roof options to enhance the existing flat rooflights to provide a more architectural look, with the added advantage of additional daylight.

The first option was a very flat cone design which increased the average daylighting from 3% to 4%. However, by remodelling the cones to have an angled top surface, it allowed in much more daylight due to the south facing orientation.

By doing this we managed to increase the average daylight to over 6% which is more than double the existing provision.

According to CIBSE Lighting Guide 5 (LG5) anything over an average daylight factor of 5% is predominantly daylit and artificial lighting will not be required.