Plenitude is converting LED billboards to dark mode across Italy, Spain and France, cutting power draw by up to 74% and inviting other advertisers to follow. LED billboards run hot. The brighter the pixel, the more current it draws — which means the white backgrounds, vivid skies, and sun-drenched product shots that dominate digital out-of-home advertising are also the most energy-intensive to display. Plenitude , the retail energy arm of Italian oil and gas group Eni, has decided to address that. As of mid-April, the company is converting all its LED creative across stores in Italy and DOOH placements in Italy, Spain and France to a dark-mode aesthetic: black and deep-toned backgrounds, with brand elements rendered in lower-luminance palettes. The energy case is straightforward, and particularly urgent as the escalating conflict between the US and Iran continues to destabilize global oil markets and drive energy costs to record highs.…