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Fluorescent lamp

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Will led save money or not ? First part: Led life span.

Before we explore will led save money or not, we need to know three methods of saving money. First, average life span; Second, luminous efficiency; Third, average power use. Today, we start with Life span. Let’s try to make it short and easy for understand. Normally incandescent lamp which we use is invented at 1878 … Continue reading