Two kinds of light sources are known to exist: primary, those which emit light, and secondary, those which reflect light. In both cases we can find them naturally and artificially.
I am surrounded by people who I believe know light—good light. So I thought it would be far more interesting if those people somehow wrote this article. I individually asked them via WhatsApp to tell me what they thought was the best source of light, or what their favourite was. Nothing else.
The light of all lights, and the most obvious one on this planet, is the sun. Nina Ordeig, Javier Marset, Jordi Canudas, and Yosigo all directly said this source. This is the one I would have said, too. The sun perfectly demonstrates, apart from being essential to life, the importance of how a source of primary light needs, in every situation, to be filtered or controlled to be comfortable. Parasols, sunglasses, blinds, curtains, clouds, awnings, or even winter itself, which uses distance as a filter, are all good examples of this.
Jaume Ramírez answered with an artificial primary: the incandescent light bulb, specifically the one by Tapio Wirkkala, Model 85, designed in 1959. Xavier Mañosa answered by email, since his Nokia 3310 doesn’t have WhatsApp, saying his favourite is an LED lamp in the operating room of Trumpf Medical. Igor Urdampilleta had me choose between the lifelong Linestra and the Yayho collection by Ingo Maurer. I don’t know which to pick. Diego Ramos also sent me two pieces, but they have more installation and experimentation than anything else: Arcades by Eva Rucki, Conny Freyer and Sebastien Noel (Troika) and Watt? by Paul Cocksedge.
Nina Masó chose fireflies and Toni Arola went with a kind of plankton he saw once in Mallorca, in Capdepera, specifically. This last one works for bioluminescence, which is a natural kind of fluorescence. The cause of its lustre is a unicellular algae called Noctiluca Scintillans, also known as sea sparkle. The concentration of these plants form this plankton which isn’t noticeable during the day, but which, in the dark, evince small flashing lights. Unlike plankton, fireflies have luminous organs which, when they absorb oxygen, combine with a substance called luciferin. The chemical reaction produces light and a touch of heat. At least that's what Wikipedia says.
David Martí always told me that the hard part about a source of light was controlling the balance between comfort and efficiency. We can apply this to anything, but with light you have to be especially alert, since we have to prioritise efficiency on top of comfort. David, like Igor and Diego, gave me many options to choose from. And the same thing happened: I don’t know which one to choose. One New Flame by Ingo Maurer, Tetatet by Davide Groppi or the Huevo de Colon by Gabriel Ordeig.