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LED T8 Tube 150 cm 25 Watt 3500 Lumen 4000K Flicker Free 140lm/W
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LEC Expert blog - Thoughts and expert solutions in LEDs
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Nedelja Bik Dan zahvalnosti 250 lm in watt - angelistudio.com
Watts to Lumens: How to Determine Your Lumen Count - HDVideo Pro
What is the theoretical limit of lumen/watt for lighting systems? - Electrical Engineering Stack Exchange
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Verschil tussen lumen en watt Adviescentrum, PartsNL
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