Innovation Who Invented the Light Bulb? It Wasn't Just Edison Innovation How Light Sticks Work Physical Science How Lasers Work Environmental Science How LED Light Bulbs Work Advertisement How Fluorescent Lamps Work By: Tom Harris Many offices have fluorescent lamps as a primary source of ...
Fluorescent and LEDs bulbs create a two-fold problem when it comes to sleep. First, they produce artificial light. Second, they produce blue light. Blue light wavelengths produced by electronics and overhead lights boost attention, reaction times and mood, according toHarvard Medical School. This ...
Until recently, LEDs were too expensive to use for most lighting applications because they're built around advanced semiconductor material. The price of semiconductor devices plummeted after the year 2000, however, making LEDs a more cost-effective lighting option for a wide range of situations. Whi...
Two decades later, three Japanese-born scientists (Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura) invented blue-light-emitting diodes using the semiconductor gallium nitride, earning them the Nobel Prize in Physics in 2014. Red and green LEDs had been around for years—if you can remember ...
Other places you now see LEDs used outdoors are on traffic lights and automobile brake lights. On a color CRT television set, all of the colors are produced using red, green and blue phosphor dots for each pixel on the screen: In a jumbo TV, red, green and blue LEDs are used instead...
When the new lighting standards began in 2012, prime replacements for the incandescent light bulb were the higher-efficiency compact fluorescent lamps (CFL) and the light emitting diodes (LEDs). The CFL, though, has its own problems, primarily the inclusion of toxic mercury in the design and ...
When the new lighting standards began in 2012, prime replacements for the incandescent light bulb were the higher-efficiency compact fluorescent lamps (CFL) and the light emitting diodes (LEDs). The CFL, though, has its own problems, primarily the inclusion of toxic mercury in the design and ...
Tomb and colleagues studied the effect of violet-blue light on the reduction of phage ΦC31 (genetic material on form of dsDNA) [61]. For the 103 PFU/mL, they achieved a 2.7 log reduction after exposure to 0.3 kJ/cm2, while ΦC31 titer of 105 and 107 PFU/mL were successfully ...
“blue” light (even though it looks white), a daylight signaler to our minds. Be it LEDs, fluorescent lighting, or the backlit screens of our portable devices, it’s easier for our bodies to get confused. It’seven moreconfusing when your body clock thinks it’s halfway around the ...
The first LED was invented by accident in 1961 by James R. Biard and Gary Pittman, while working on developing semiconductors. Shortly after that, IBM began to use them in punch-card readers. Although LEDs were used widely in numerous industries, it wasn’t until 1999 that thefirst LED fla...