Inexpensive halogen torchere lamps, whose 300-watt bulbs can reach a temperature of 970 degrees, have become extremely popular, especially on college campuses. But because of their high heat ...

Inexpensive halogen torchere lamps, whose 300-watt bulbs can reach a temperature of 970 degrees, have become extremely popular, especially on college campuses.But because of their high heat ...

In the war against global warming, increasing light bulb efficiency is low-hanging fruit. Assuming 40% thermal to energy conversion, it takes 428 pounds of coal to power a single 60 watt light ...