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LED filaments emit light evenly in all directions. They look just like incandescent bulbs. Unlike conventional LED chips are encapsulated in a transparent synthetic sapphire and coated with phosphor. It is very thin with a diameter of only 1.2 mm and length of 45 mm. Sapphire has a much higher thermal conductivity than glass. This ensures better cooling of the chips and thus a much better parameters, than cheaper glass encapsulation. This is COG technology which allows to achieve the more than 100 lumens per Watt and excellent color rendering index Ra ≥ 80.

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