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The handheld version of the system was named one of the top ten greatest inventions by the U.S. Army in 2005, and the Packbot robotic platform with the integrated Fido explosives detector received the same award in 2006. [36] [37] In 2007, Timothy Swager won the $500,000 Lemelson-MIT Prize for his work on amplifying fluorescent polymers.
The red adaptation goggles became obsolete as image intensifiers allowed the light produced by the fluorescent screen to be amplified and made visible in a lighted room. The addition of the camera enabled viewing of the image on a monitor, allowing a radiologist to view the images in a separate room away from the risk of radiation exposure .
1991 Philips invents a fluorescent lightbulb that lasts 60,000 hours using magnetic induction. 1994 T5 lamps with cool tip are introduced to become the leading fluorescent lamps with up to 117 lm/W with good color rendering. These and almost all new fluorescent lamps are to be operated on electronic ballasts only. [4]
Most individual light sources can be rotated and aimed for where light is needed most in an emergency, such as toward fire exits. Modern fixtures usually have a test button of some sort which simulates a power failure and causes the unit to switch on the lights and operate from battery power, even if the main power is still on.
The first mass-produced dry cell batteries came in 1896, and the invention of portable electric lights soon followed. Portable hand-held electric lights offered advantages in convenience and safety over (combustion) torches, candles and lanterns. The electric lamp was odorless, smokeless, and emitted less heat than combustion-powered lighting.
[19] Improper use of safety lamps defeated the purpose of the safety lamp and caused risk. When the flame went out in a lamp there was a temptation for the collier to open and relight it. Some opened the lamps to light tobacco pipes underground. [20] Both of these practices were strictly forbidden.
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