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A 230-volt LED filament light bulb, with a B22 base. The filaments are visible as the four yellow vertical lines. A LED filament light bulb is a LED lamp which is designed to resemble a traditional incandescent light bulb with visible filaments for aesthetic and light distribution purposes, but with the high efficiency of light-emitting diodes (LEDs).
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
For example, the top bulbs listed in the 2016 Consumer Review have a CRI of 80. [3] In 2008, the U.S. Department of Energy created the L Prize to find an incandescent light bulb replacement that met efficiency metrics and had a CRI above 90. [4] On August 3, 2011, Philips was declared as the first winner of the L Prize. [5]
An LED filament consists of multiple LED chips connected in series on a common longitudinal substrate that forms a thin rod reminiscent of a traditional incandescent filament. [59] These are being used as a low-cost decorative alternative for traditional light bulbs that are being phased out in many countries.
The filament in a tungsten light bulb is not easy to break when the bulb is cold, but filaments are more vulnerable when they are hot because the incandescent metal is less rigid. An impact on the outside of the bulb may cause the filament to break or experience a surge in electric current that causes part of it to melt or vaporize.
The bulb's longevity has been attributed to the high quality of its manufacture, [4] it being seldom turned off, [5] [6] and its low wattage. [5] [6] Originally a 60-watt bulb, the light has for many years emitted dim light equivalent to a 4-watt bulb, about the strength of a nightlight. [4]