LED, but not ugly, the filament LED bulb uses LEDs connected in series on chopsticks of circuit board. Everything is covered with a translucent resin to diffuse the light. It is in no case of filament of tungsten as at the time of the old incandescent bulbs.
Aesthetic and visual appearance
These new LED bulbs filament-shaped provide a Visual rendering close to bulbs incandescent thanks to their bright part that really resembles a filament. The color rendering is improved compared to the classic power white LED (IRC of the order of 90 color rendering index). There are different Temperaturesles bulbs contain several filament LED sticks and thus give a near effect of the filament into several segments. Transparent glass of the light bulb lets see, as on the clear incandescent light bulb, the light source segments. The LED bulb filament to reconcile those nostalgic for incandescent bulbs and new technologies offering luminous efficiency.
The filaments of LED technology
To get the fine form that recalls the filaments, LEDs are very small (the filament is in the order of 2mm in diameter, including resin) and are in series. This technology is called COB (chip on board) that could be translated by “chip on electronic map”. The filament is made up of several LEDs mounted in series with a small stick of miniature printed circuit.
COB LED: row of LEDs mounted in series, drowned in a resin
Example of filament LED 1W
New filament LED bulbs (on sale in Ledlightsclassified.com) are offered in power 2W, 4W and 6W and large compatible with any socket nerve:
Light bulb filament LED COB: 2W, 4W, 6W and
The 2W LED bulb has 2 sticks of LED, 4W LED bulb has 4 sticks of LED, and the 6W has 6 sticks.
CroLED® COB E27 6W lamp bulb Bulb Globe 6 LEDs white hot AC 220-240V 100LM/W = 100W incandescent light
We can guess that each stick of filament LED 1W. We find in sale of filament LED 1W poles similar to those of the filament LED bulbs. Here are some features:
-Opening angle: 360 ° – life: 50000 hours – brightness: 130 lumens – Dimensions: 40 x 2 x 2 mm – voltage: 50 – 60V – current: 15mA
Like a traditional incandescent bulb filament, the filament led pays its soft light on 360 ° angle. Announced life is 50000 hours, or 50 times more than an incandescent bulb. Announced brightness is even better than the conventional white LEDs (130 lumens per Watt according to the manufacturer’s data)
With 50 – 60 v operation current of 15mA, the filament is a set of small white LEDs in series! Knowing there is a voltage of 3V – 3.5V at the terminals of a white LED in operation, we can infer that there are about 15 LEDs connected in series.
LED color: blue or white?
In fact, it is possible to use blue LEDs mounted in series with above outdoor resin that serve both mechanical protection and fluorescent substance that converts the blue in yellow, as in all white LED. That is why that the spectre of a white LED is always more or less the same pace: a spike in sharp enough blue due to the blue LED, and a Bell in orange yellow due to the fluorescence of the substance lining the white LED:
Typical spectrum of a white LED
This fluorescent substance receives the blue light and radiates yellow. It is the combination of the two colors that produces white light. Here is a sketch of COB white LED:
White LED COB: row of blue LED and resin
Using a resin that drowns all blue LEDs, the final rendering looks more like a single extended light source. The LEDs themselves can be mounted on a metal (separated by an insulator end) plate, allowing to remove heat much better.
LED from the 230V power supply
These LED bulbs are fed by 230V. There is probably a simple ultra capacitive power without transformer hiding in the nerve to the bulb. There is no electrical insulation between the sector 230V (the nerve to the bulb) and the filament led saw that the glass of the bulb prevents you can touch. These bulbs work in 220-240V, and no 90-240V, which confirms whether a capacitive power.
Example of capacitive power supply 3W LED bulb
LED white COB already on sale
Since 2014-2015, we can finally find LED bulbs that reconcile the design lovers retro vintage of the incandescent light bulb and light efficiency of the LED.
Bulb LED equivalent 6W 100W filament:
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