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14 lumens per watt I-PW The efficacy of incandescent lamps was gradually loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentssitereader033viewer20220415055e248e4aa363e9126c1207a2html5thumbnails2jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=mediadist-2019-06-27-carbon-filament-lamp-was-limited-to-the-low-value-of-14htmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: mediadistributordatasolutionscom · 2019-06-27 · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentssitereader033viewer20220415055e248e4aa363e9126c1207a2html5thumbnails3jpg width=140 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the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentssitereader033viewer20220415055e248e4aa363e9126c1207a2html5thumbnails5jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=mediadist-2019-06-27-carbon-filament-lamp-was-limited-to-the-low-value-of-14htmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: mediadistributordatasolutionscom · 2019-06-27 · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentssitereader033viewer20220415055e248e4aa363e9126c1207a2html5thumbnails6jpg 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limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentssitereader033viewer20220415055e248e4aa363e9126c1207a2html5thumbnails8jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=9Page 9button div class=ts-imageimg data-url=mediadist-2019-06-27-carbon-filament-lamp-was-limited-to-the-low-value-of-14htmlpage=9 data-page=9 class=ts-thumb lazyload alt=Page 9: mediadistributordatasolutionscom · 2019-06-27 · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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