Still, even with our limited vocabulary, new words are created everyday. For example, when new products are created, there is often a need to create new words. In fact, did you know that there is a new word born every 98 minutes? Depending on your criteria of what a word is, that number could be more than a million. Luckily no one person needs to memorize all of that! There are known differences between the vocabulary level of a teenager and an adult. An average teenager knows approximately 3,000 words.
This instantaneous production of light is achieved by the use of electronic ballasts. Electronic Ballast is a device which controls the starting voltage and the operating currents of lighting devices built on the principle of electrical gas discharge.
The electronic ballast has a lower THD percentage than the magnetic ballast. 2. The biggest reduction comes from the fact that electronic ballasts reduce the total load. For lighting systems, the following table provides some comparisons (3): Total Harmonic Distortion (THD): A Lesson for Lighting Harmony. By: Jerry Cassel, LC; Senior Specification Engineer . Itâs got to be THD at less than 10 percent! Many lighting designers and engineers I consult with everyday are writing master specifications, which include a requirement for THD to be at or less than 10 percent. But what does  really mean and what is the real impact to project design and cost? Definition: According to Wikipedia, the online encyclopedia for all things defined, â of a . signal. is a measurement of the . harmonic distortion present and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency.â Lesser THD, for example, allows the