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http://www.preterled.com

    Preter Lighting Co., Ltd.
  China Led Lighting Supplier
  Tel.: 0086-755-23494568
  Fax: 0086-755-29052948
 Email: sales@preterled.com

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What is lumen?
Lumen is amount of light emitted from light source.
According to Wikipedia, "If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen. Alternatively, an isotropic one-candela light source emits a total luminous flux of exactly 4 lumens. The lumen can be thought of casually as a measure of the total amount of visible light emitted." For example, a standard 100 Watt incandescent bulb emits about 1500 lumen.
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