Halo effect: Blue halos at Greenside Place in Edinburgh use Prodigy and Chamelneon cold cathode lighting from Oldham Lighting. The lighting design for Greenside Place, which is situated within a World Heritage site, was by Arup Lighting. Designers devised the lighting scheme to transform columns into decorative features or ‘light trees’. These incorporate hidden cold cathode lighting that changes colour with the time of day. Forth Electrical Services acted as electrical contractor on the project.