Here is a question about this article: In flood lamps used for photographic lighting, the tradeoff is made in the other direction. Compared to general-service bulbs, for the same power, these bulbs produce far more light, and (more importantly) light at a higher color temperature, at the expense of greatly reduced life (which may be as short as two hours for a type P1 lamp). The upper temperature limit for the filament is the melting point of the metal. Tungsten is the metal with the highest melting point, 3,695 K (6,191 F). A 50-hour-life projection bulb, for instance, is designed to operate only 50 C (122 F) below that melting point. Such a lamp may achieve up to 22 lumens per watt, compared with 17.5 for a 750-hour general service lamp.
What is the answer to this question: What is the typical life of a P1 lamp?
****
So... as short as two hours

Here is a question about this article: Estonia is a dependent country in the terms of energy and energy production. In recent years many local and foreign companies have been investing in renewable energy sources.[citation needed] The importance of wind power has been increasing steadily in Estonia and currently the total amount of energy production from wind is nearly 60 MW while at the same time roughly 399 MW worth of projects are currently being developed and more than 2800 MW worth of projects are being proposed in the Lake Peipus area and the coastal areas of Hiiumaa.
What is the answer to this question: What type of energy production as many companies been investing in recent years?
****
So... renewable energy sources

Here is a question about this article: The trustees of Columbia University refused to accept Eisenhower's resignation in December 1950, when he took an extended leave from the university to become the Supreme Commander of the North Atlantic Treaty Organization (NATO), and he was given operational command of NATO forces in Europe. Eisenhower retired from active service as an Army general on May 31, 1952, and he resumed his presidency of Columbia. He held this position until January 20, 1953, when he became the President of the United States.
What is the answer to this question: What role did Eisenhower fill after leaving Columbia?
****
So...
Supreme Commander of the North Atlantic Treaty Organization