Light Society: Cultural and Environmental Shifts

• Light society is a technologically mediated regime marked by pervasive artificial lighting that transforms nocturnal environments and cultural frameworks.
• It highlights issues such as cultural genocide through the erosion of Indigenous sky traditions and significant ecological impacts including enhanced sky-glow.
• A transdisciplinary approach integrating Indigenous perspectives, urban planning, and technical innovations is proposed to restore dark skies and preserve cultural legacies.

A light society is a technologically mediated regime characterized by the pervasive use of artificial lighting and its attendant impacts on night-time environments, human societies, and epistemic frameworks. The term, as developed by Hamacher, De Napoli, and Mott, interrogates the consequences of widespread light pollution—particularly as an agent of cultural erasure for communities whose traditions are embedded in the living night sky. Light society encompasses institutional lighting practices, urban infrastructural expansion, and the sociotechnical processes that drive and sustain the ongoing transformation of nocturnal ecologies and cultural cosmologies (Hamacher et al., 2020).

1. Foundational Concepts: Light Pollution, Cultural Genocide, and Transdisciplinarity

Light pollution is formally defined as “sky-glow from unshielded or poorly shielded light fittings that send light wastefully into the sky.” This emergent sky-brightness, significantly amplified by atmospheric scattering (notably by aerosols and moisture), can raise the natural background by factors of 10–100 in urban environments (Falchi et al. 2016).

Cultural genocide, in the context of light society, references the “deliberate destruction of traditions, knowledge, and cultural frameworks” encoded in celestial observation. This process is characterized as “slow violence” in line with Nixon (2011), where cumulative technological interventions (e.g., the deployment of unshielded LEDs) incrementally erode the sky-archive fundamental to Indigenous identity.

A transdisciplinary approach is adduced as imperative for effective mitigation, transcending multidisciplinary and interdisciplinary paradigms by co-generating methods and theories through sustained collaboration among astronomers, ecologists, engineers, health scientists, landscape architects, and, critically, Indigenous custodians. This approach is predicated on decolonizing methodologies and the foundational inclusion of Indigenous philosophies.

2. Cosmological Frameworks and Deep-Time Societal Relations

The ontological status of the night sky as a mnemonic structure, law code, and navigational system is emphasized in multiple Indigenous traditions. For example, the Emu in Kamilaroi and Euahlayi contexts is constituted by the dust lanes of the Milky Way, with its orientation and altitude at dusk regulating ecological actions (such as emu-nesting), resource harvest cycles, and ceremonial or kinship proprieties. The metonymic dictum that “everything is written twice, on the ground and in the sky” signifies the astronomical encoding of knowledge and law.

These frameworks regulate and maintain social structure, territorial management, temporal cycles, and oral tradition. The erasure of celestial markers such as Ginan (Epsilon Crucis) from the viewscapes of urban centers like Melbourne or Sydney constitutes a direct threat to the continuity of this knowledge system.

3. Contemporary Drivers of Sky-Glow and Their Impacts

Three principal vectors are identified in the escalation of sky-glow within light societies:

• Urban Expansion: As cityscapes proliferate, the aggregate area exposed to artificial lighting increases. Satellite data from 2012–2016 demonstrate a 10% growth globally in regions where sky-glow exceeds double the natural background.
• Lighting Design Deficiencies: The prevalence of unshielded or poorly oriented exterior lighting (street lamps, floodlights, security systems) contributes significant upward luminous flux. Visual documentation from Siding Spring Observatory illustrates extraneous glow from coal-seam-gas flares and industrial sources.
• LED Proliferation: The rapid adoption of “white” (blue-rich) LEDs peaking at 450–470 nm has dual deleterious effects: (a) blue wavelengths are scattered in the atmosphere as Rayleigh scattering (∝ λ⁻⁴), attenuating less with distance and thus intensifying urban halos; (b) chronic exposure disrupts human circadian biology and modulates nocturnal fauna behavior.

The cumulative impact is a transformation of the angular and spectral sky radiance function, $L(\theta, \lambda)$, with increases on the order of multiple magnitudes over pre-industrial baselines.

4. Sky Erasure as an Act of Cultural Genocide

Hamacher et al. explicate the analogy between land dispossession and sky-theft, positing that the relentless expansion of upward-directed lumens constitutes an act of cultural genocide: “the destruction, in whole or in part, of the cultural heritage of a people.” The processes of fracking, industrial expansion, and proliferation of urban lighting are mapped directly to the attenuation and disappearance of celestial markers essential for cultural transmission. Each increment of luminosity is conceptualized as an incremental erasure of memory, law, and collective Indigenous identity.

The framework of “slow violence” makes visible the long-term, aggregate loss suffered through cumulative technological interventions, reframing light pollution as neither benign nor incidental but as a persistent modality of epistemic and cosmological dispossession.

5. Decolonizing and Transdisciplinary Remediation Frameworks

Against prevailing management regimes centered on cost minimization and astrophysical preservation, a decolonizing transdisciplinary protocol is advanced. Core elements include:

• Direct partnership with Indigenous custodians, redefining “dark sky” as an animate, relational domain rather than a strictly radiometric phenomenon.
• Integration of Indigenous aesthetic principles, with design solutions such as amber lighting (chromatically aligned with red ochres) and downward-oriented fixtures. Programmable luminaires are synchronized with ceremonial, not merely utilitarian, cycles.
• Research collectives structured to place Indigenous epistemologies at their core, counteracting the epistemic “whitewashing” typical of Western-dominated frameworks.

This approach unites technical prescriptions (full cut-off fixtures, spectrally limited LEDs, programmed schedules) with sociocultural priorities, embedding living sky narratives within educational, urban planning, and artistic institutions.

6. Policy, Regulatory, and Design Imperatives

A spectrum of policy and design strategies are delineated for transitioning toward an ethically grounded light society:

• Lighting codes stipulating full-cutoff geometries, angular and spectral regulations (e.g., ≤ 3000 K, minimized output <500 nm).
• Recognition and administrative protection of dark skies as intangible cultural heritage; co-management and custodianship by Indigenous communities over territorial lighting.
• Economic incentives for the creation of dark-sky parks and “dark pockets” within urban areas, including tax relief for low-impact retrofits and public art linked to traditional cosmologies.
• Public health protocols limiting exposure to blue-rich light during evening hours.
• Mandatory cultural impact assessments for major industrial/extractive projects, targeting predicted sky-glow footprints analogous to standard ecological impact reporting.

The unification of technical, regulatory, and decolonizing frameworks is asserted as essential for the preservation of reciprocal relationships between societies and the cosmos, ensuring the vitality of the sky as a living archive central to cultural heritage (Hamacher et al., 2020).