Why do the bulb filaments glow

LED filaments - LED filament lamps of the next generation in "filament design"

LED filaments–  Next generation LED filament lamps inIncandescent filament design

Saying goodbye to the light bulb is difficult. Many people would like to protect the environment and reduce their electricity bills with modern light sources, but at the same time they hang on to the familiar light bulb, which has been a symbol for electric light for 150 years.

The manufacturers of LED lamps have actually done their homework and created light bulbs that are completely compatible with light bulbs. LED lights have the well-known Edison screw sockets or standardized plug-in bases for halogen systems, and the shapes are so similar to the models that you can replace incandescent and halogen lamps 1: 1. Lampshades do not need to be replaced. While a light bulb radiates the light practically at a 360 ° angle, an ordinary LED reaches a maximum of 180 °. As long as you cleverly arrange several LEDs and send the light through a matt bulb as a diffuser, that's no problem. The look of clear glass bulbs with visible filaments falls by the wayside.

As early as 2008, the Japanese manufacturer Ushio Lighting succeeded for the first time in creating a market-ready lamp in which individual LEDs were positioned horizontally above the base like a filament. The problem with the beam angle remained, however, because the LEDs heated up and therefore required a complex heat sink that prevented them from shining in this direction.

It was not until five years later that LED filament lamps came onto the market from Taiwan and China that were able to overcome this problem. With higher efficiency and a correspondingly reduced performance, they do not need any special cooling, but can transfer the remaining heat inside the lamp to a filler gas (helium) and via this inert gas to the bulb. Current LEDs are so efficient that an LED filament lamp can replace an incandescent bulb of up to 60 watts without problems with cooling which would reduce the service life.

This is made possible by LED lamps with LED filaments. A typical LED filament, also called LED filament after the English name, consists of a narrow strip of sapphire crystal and measures almost 40 millimeters in length and 2 millimeters in width. Many, mostly 25-30 tiny LEDs are arranged on it and connected in series. This technology is called chip on cord technology based on the proven chip on board technology (COB). A fluorescent layer gives the filament its yellowish color and provides warm white light, usually adjusted to a color temperature between 2400 and 2700 Kelvin.

Thanks to the "new old" design, the warm white light is emitted evenly almost all around (300 degrees). With between 250 lumens (25-watt replacement) and 806 lumens (60-watt replacement), the luminous flux is just as high as with the respective historical model.

LED filament lamps, deceptively similar to the "good old" light bulb, will convince even the greatest skeptic. They outperform incandescent and halogen lamps in their luminous efficacy by seven to ten times and thus meet the requirements for energy efficiency classes A + and A ++. In the meantime, dimmable versions in decorative pear or candle shape are also available.

Edison would have been delighted with the LED filament lamps.

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