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leotek-ecological-lighting-specification-public-project-cover
Sustainabilty
Johnny

How to Write an Ecological Lighting Specification for Public Projects

An ecological lighting specification defines the site, sensitive habitats, required lighting tasks, and verifiable limits on direction, spectrum, output, timing, and maintenance. For a public project, it should require bidders to show how the proposed equipment and controls meet those requirements while leaving final design values to the responsible engineer and applicable authority.

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leotek-spd-vs-cct-ecological-outdoor-lighting-cover
Sustainabilty
Ethan Peng

Spectral Power Distribution vs. CCT for Ecological Outdoor-lighting Evaluation: Why SPD Matters More

For ecological outdoor-lighting evaluation, spectral power distribution (SPD) is more informative than correlated color temperature (CCT) because it shows how a source’s output is distributed across wavelengths. CCT describes apparent color, while ecological effects also depend on the amount, direction, timing, duration, setting, and organisms exposed to the light.

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