Lightbulbs brighten up the room with clean, invigorating light. I use them at the gym which has 10 wall lights and a ceiling fan with two lights. Two LED ceiling fan lights were recommended by a local hardware store vendor to replace old CFL light bulbs. Everything about LED bulbs was superior to CFL bulbs, which prompted me to buy 10 sets of Feit LEDs for the walls. Once installed the Feit bulbs were great. They changed the mood of the room and gave it the feel of bright sunlight - great for a workout. They've been running for eight months now and they still light up the room like the first day. Although I'm happy with the purchase, I'm giving it four stars because it's only been 8 months. The test for a fifth star will be performance over time. Note: I'm not a lighting expert, but this helped me a lot to become familiar with the Kelvin (K) and Lumen temperature scales. Kelvin is the color temperature: 2000-3000K = warm white light, 3100-4500K = cool white light, 4600-6500K = daylight. Lumens measure the amount of visible light that is emitted. При поиске замены лампы, несколько основных цифр, которые помогут получить представление о том, сколько света будет на выходе: 60-ваттная лампа накаливания излучает около 800 люмен, а 100-ваттная лампа накаливания излучает около 1600. Таблицы для Кельвина и Шкалы люмена можно найти on the Internet.
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