Argon has a lower glow voltage, argon helps the smaller lamps start at a lower voltage. The larger LPS lamps used in street lighting for the most part do not use argon. 2. LPS Development and Inventors: Low pressure sodium lamps were invented first in 1920 by Arthur H. Compton at Westinghouse.
1. the pleasure felt when having a good time. 2. act of receiving pleasure from something. 3. (law) the exercise of the legal right to enjoy the benefits of owning property. Familiarity information: ENJOYMENT used as a noun is uncommon.
Happiness, gladness or joy is a mental or emotional state of well-being defined by positive or pleasant emotions ranging from contentment to intense joy. A variety of biological, psychological, religious and philosophical approaches have striven to define happiness and identify its sources. Various research groups, including positive psychology, are employing the scientific method to research questions about what happiness is, and how it might be attained.