In the past, I’ve tended to categorize light sources something like this:
- Gas-Discharge Tube,
- LED (Semiconductive, Light-Emitting Diode).
But, there seems to be a light-bulb on the market right now, that defies this system of categorization, as shown here:
The yellowish parts that emit the light will look something like decorative, low-temperature tungsten filaments when lit, but are not in fact filaments at all. They seem to be narrow, tubular, Electroluminescent parts of unknown composition.
What I find most striking about this design, is that it also does not have a power converter in the base, instead just applying the 110 VAC house-current directly to the apparently-electroluminescent material, with passive wires inside the bulb.
When trying to form some sort of guess, as to what the EL material could be, my attention goes next to the fact that by now, organic semiconductors exist. These types of semiconductive polymers are often the basis for OLEDs, also known as Organic Light Emitting Diodes.
With a true LED design, actual, electrical diodes need to exist, that operate at low voltages and correspondingly higher currents, and due to which, the light-bulbs have required power-converters in their base. Those power-converters would also be the main point of failure, that limits the lifespan of an LED light-bulb. Those power-converters have also tended to become quite hot in-use.
But because this type of light-bulb does not form an electrically-correct diode, I would not call this form an LED. What seems to have been done, is that some mixture of organic semiconductors has been pressed into a shape, and the house A/C applied directly to it. This means that they could potentially outlast more-conventional LED-light-bulbs, but should also have slightly lower energy-efficiency.
They look pretty when lit.
The packaging of this light-bulb made some statements which I do not believe to be entirely accurate.
- The lightbulb-type is stated to be an LED,
- It’s said to be equivalent to a 40W incandescent,
- It’s said to have a life-expectancy of 9 years,
- It’s stated to draw 4.5W of real power.
The only packaging-information above which I believe to be accurate, is the consumption of 4.5W.
( Last Updated 08/31/2017 … )