Nelson Soares Moreira : Lighting – the light that lives within us

Light is not only what allows us to see. It is also what allows us to be. In the most intimate space we inhabit – the home – lighting is decisive: it shapes perception, conditions mood, and influences biological rhythm. Light defines the space, but it also defines how our brain responds and how our body adjusts.
Each room requires its own light. Not only because of its function, but because of the neuronal and biochemical effects it produces.
In the kitchen, for example, the intensity and tone of light affect our energy and concentration. Light that is too cold can make the space feel impersonal, almost clinical. Warmer light, by contrast, creates comfort and closeness, even in practical activities. The balance between clarity and warmth is essential.
At night, lighting should be warmer and more diffuse. This is not a matter of aesthetics, but of physiology. Bright, white light artificially prolongs alertness, inhibiting the production of melatonin, the hormone that prepares the body for rest. Warm, gentle light lowers brain frequency, favours neuronal deceleration, and naturally leads towards sleep. To illuminate, in this sense, is to regulate inner rhythms and align the body with its natural cycle. The relationship between light and the seasons of the year is equally decisive. In winter, reduced exposure to sunlight lowers serotonin production, with an impact on mood and vitality.
Artificial lighting must compensate for this deficiency, creating environments that foster energy and motivation. In summer, when the abundance of natural light already fulfils that role, artificial lighting should remain discreet, merely complementary, allowing the body to synchronise with natural light. More than aesthetics or
functionality, lighting is a matter of health. It is the invisible thread linking architecture, biology, and mind, creating environments that we not only inhabit but that also inhabit us. When we choose the right light, we are not simply deciding how we wish to see our home: we are deciding how we want to feel, to think, and to live within it.
In this sense, lighting also enters the domain of justice and law.
The right to health, enshrined constitutionally, is not limited to hospitals or medical systems. It also includes the duty to create living conditions that foster physical, cerebral, and emotional well-being.
The home, as the most intimate and vital of spaces, must be lit in a way that safeguards this dimension. Adequate lighting is, therefore, a silent form of justice: it guarantees balance,