It all starts with the cap: screw-in E27 and E14, the small E12, the B22 bayonet, and GU10 and GU5.3 for spotlights. The next number is colour temperature — 2200–3000 K gives a warm yellowish light for living rooms, 6000 K a cool white better suited above a desk. Forever Light's range holds ordinary bulbs and small decorative G40 models, while Yeelight and Shelly ones are smart, dimmable from a phone. When replacing an old bulb, look at lumens as well as the cap — watts no longer say anything about an LED bulb's brightness.
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It all starts with the cap: screw-in E27 and E14, the small E12, the B22 bayonet, and GU10 and GU5.3 for spotlights. The next number is colour temperature — 2200–3000 K gives a warm yellowish light for living rooms, 6000 K a cool white better suited above a desk. Forever Light's range holds ordinary bulbs and small decorative G40 models, while Yeelight and Shelly ones are smart, dimmable from a phone. When replacing an old bulb, look at lumens as well as the cap — watts no longer say anything about an LED bulb's brightness.