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14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails2jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=mediadist-carbon-filament-lamp-was-limited-to-the-low-value-of-14-lumens-per-watthtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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data-page=5 class=ts-thumb lazyload alt=Page 5: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails5jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=mediadist-carbon-filament-lamp-was-limited-to-the-low-value-of-14-lumens-per-watthtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails6jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=7Page 7button div class=ts-imageimg data-url=mediadist-carbon-filament-lamp-was-limited-to-the-low-value-of-14-lumens-per-watthtmlpage=7 data-page=7 class=ts-thumb lazyload alt=Page 7: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails7jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=8Page 8button div 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gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails9jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=10Page 10button div class=ts-imageimg data-url=mediadist-carbon-filament-lamp-was-limited-to-the-low-value-of-14-lumens-per-watthtmlpage=10 data-page=10 class=ts-thumb lazyload alt=Page 10: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails10jpg width=140 height=200 divdivdiv class=ts-pagebutton 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watt I-PW The efficacy of incandescent lamps was gradually improved through loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader033vdocumentsnetreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails12jpg width=140 height=200 divdiv