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This image Dark interiors help to relax and de-stimulate our eye–mind system, as Colin Ball explains p059


EDITED BY JILL ENTWISTLE


LIGHTINGFOCUS 1 A state of flux


As new metrics for non-visual effects on circadian systems enter the mix, Jill Entwistle looks at the complexities beneath the apparently simple proposition of lighting a space / p054


2 Back to Black


Colin Ball, lighting director at BDP, looks at how both energy saving and consideration for human biology are driving more nuanced light levels in workspaces / p059


3 Virtuous circle


Lighting designer and sustainability expert Bob Bohannon looks at the urgent need to apply the circular economy to lighting, and why sectors such as retail should be among the first to adopt it / p066


DONAL MURPHY


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