File:Luminous efficacies light sources.png

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Luminous_efficacies_light_sources.png(747 × 466 pixels, file size: 83 KB, MIME type: image/png)

The development of luminous efficacies of light sources

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current12:56, 30 August 2017Thumbnail for version as of 12:56, 30 August 2017747 × 466 (83 KB)Admin (talk | contribs)
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