How a Light Bulb Really Works ????

Tungsten Halogen Lamps are similar in construction to conventional gas filled tungsten filament lamps except for a small trace of halogen (normally bromine) in the fill gas. The halogen gas reacts with the tungsten that has evaporated, migrated outward, a

The tungsten filament is used most often with incandescent lamps because it has a high melting point (around 3419°C) and a low rate of evaporation. The bulb is filled with an inert gas to slow the rate of evaporation even further.

In 1958, E.G. Fridrich and E.H. Wiley had has developed Tungsten Halogen Lamp by introducing a halogen gas (basically Iodine) inside the incandescent lamp. Basically, without halogen gas, incandescent lamp filament gradually losses its performance because

Tungsten will not create much visible light unless it has so many electrons shoving deeply into its atoms to reach the orbits that make visible light. The heat grows, because reaching those visible-generating rings needs more and more electrons.

Older lamps equipped with tungsten wire filaments and filled with inert argon gas are frequently used in student microscopes for brightfield and phase contrast imaging, and these sources may be sufficiently bright enough for some applications requiring po

鹵素燈泡 （英語： Halogen lamp），又稱 鎢鹵燈泡 、 石英燈泡 、 鹵素燈珠，是一種改良的 白熾燈，其燈泡內部填充了少量的 鹵素 氣體（如 碘 或 溴）。 [1] 與傳統白熾燈相比，鹵素燈泡利用鹵素循環再生燈絲，延長燈絲壽命並提高工作溫度，從而獲得更高的亮度、色溫和發光效率。 鹵素燈泡具有體積小、易於控制、顯色性好等優點，曾廣泛應用於汽車前燈、舞台照明、室內照明等領域。 但由於其發光效率仍然較低，且存在紫外線輻射等問題，近年來正逐漸被更換為節能環保的 LED燈 所取代。 鹵素燈泡與普通白熾燈