Context: An LED filament consists of multiple LED dice connected in series on a common longitudinal substrate that form a thin rod reminiscent of a traditional incandescent filament. These are being used as a low cost decorative alternative for traditional light bulbs that are being phased out in many countries. The filaments require a rather high voltage to light to nominal brightness, allowing them to work efficiently and simply with mains voltages. Often a simple rectifier and capacitive current limiting are employed to create a low-cost replacement for a traditional light bulb without the complexity of creating a low voltage, high current converter which is required by single die LEDs. Usually they are packaged in a sealed enclosure with a shape similar to lamps they were designed to replace (e.g. a bulb), and filled with inert nitrogen or carbon dioxide gas to remove heat efficiently.

Question: What does an LED filament consist of?
Answer: multiple LED dice

Question: How are LED filaments used?
Answer: a low cost decorative alternative for traditional light bulbs

Question: What type of voltage is needed for LED filaments?
Answer: high

Question: What helps LED filaments remain low cost?
Answer: a simple rectifier

Question: Single die LEDs require what?
Answer: high current converter

Question:  What does an non-LED filament consist of?
Answer: Unanswerable

Question:  How are non-LED filaments used?
Answer: Unanswerable

Question:  What type of voltage is needed for non-LED filaments?
Answer: Unanswerable

Question:  What helps non-LED filaments remain low cost?
Answer: Unanswerable