ABSTRACT
The human visual system is sensitive to energy between 380 and 780 nm in wavelength. This is the visible region of the larger electromagnetic spectrum, and it is this small visibly perceptible portion that is called ‘light’. Nearly all matter responds in some way to electromagnetic interaction (Boyce, 2003). Some matter-energy interactions are, in human terms, destructive and when that becomes part of the totality of energy impinging on paintings in museums, galleries, or in our homes, these interactions demand attention and must be blocked, avoided, or otherwise managed to avoid their longer-term consequences.
