What are Lumens? + Different Types of Light Bulbs: Incandescent, Halogen, CFL / Fluorescent and LED

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Yan Huang explains what lumens are in simple terms and explains the different types of light bulbs including the standard incandescent light bulb, halogen lights, CFL (compact florescent lamp) lights and LEDs from his experience in dealing with lighting from photography as well as his side projects that deal with specific types of lights. http://yanhuang.me
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