What is the real Lumen of a LED bulb? Looking at the numbers.
SOLHETTA LED bulb E12 250 lumen, globe opal - IKEA
Lumens Calculator: How Many Lumens Do I Need for a Room? – Insights
LED Lumens To Watts Conversion Chart - The Lightbulb Co. UK
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Led Bulb E27 12W Wide angle 984 lumens
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Plug and Play Universal Fit LED T8 4 FT Tubes, 3000K Soft White, 15 Watt, 1900 Lumens - Works with electronic T8 ballasts or without ballasts (bypass), Clear Lens