Artf lightppt 2

1. The Discovery of Artificial Light
Presented by
Arpan Mandal
Ankita Chakrawarti
Moumita Sadhukhan
Koustabh Sengupta
Anal Mandal

2. Index
 Introduction to light sources
 History of artificial light types
 Evolution of light
 BULB
 Fluorescent Light
 CFL
 Discharge Lamp
 LED
 Conclusion

3. Light Sources
Light Sources
Natural
Sunlight
Moonlight
and
Lightning
Artificial
Incandescent
Bulbs
Fluorescent
lamps, LED
lamps, etc.

4. What is Artificial lighting?
 Man made lighting
 For human to function properly
 All artificial light can be turned
on and off with a switch

6. Evolution of Artificial Light
1. Incandescent Light (BULB)
 Thomas Alva Edison invented the
first electric light bulbs in
1879AD
 Filament heated by an electric
current produces light rays
 Less energy efficient

7. Evolution of Artificial Light
1. Incandescent Light (BULB)
 Contains Nitrogen or Argon gas
 Tungsten filament with lead wires burns when
electricity is passed
 Also called as tungsten filament bulb
 Advantage-light quality and color are very
consistent
 Disadvantage- requires lot of energy and faster
degradation of filament leading to shorter
lifespan

8. 2. Fluorescent Lights
 Low pressure mercury-vapor gas-
discharge lamp that uses fluorescence
to produce visible light.
 More Energy efficient than
incandescent light
 Peter Cooper Hewitt, Edmund Germer
invented mercury vapor lamp
 Firstly, fluorescent tube lights were
invented and improved in 1934 AD
by George Inman and Richard Thayer
Evolution of Artificial Light

9. Evolution of Artificial Light
 In a CFL, an electric current is driven
through a tube containing Argon and a
small amount of Mercury vapor. This
generates invisible ultraviolet light that
excites a fluorescent coating
(called phosphor) on the inside of the
tube, which then emits visible light.
3. Compact Fluorescent Lights

10. Evolution of Artificial Light
4. Discharge Lamps
 Discharge lamps provide high luminous efficiency combined with long
life, resulting in the most economical light source available
Types of gas-discharge lamps:
A- Low pressure discharge lamps
B- High pressure discharge lamps
C- High-intensity discharge lamp

11. Evolution of Artificial Light
5. LED (light emitting diode)
LED is high intensity discharge light, it uses
semi-conductors to convert electrical energy
directly into light.
 Colorful LED indicators were
invented at the time of CFLinvention
 LED began just as indicator in
calculators, traffic signs, etc.
 White LED lights were invented by
Nick Holonyack in 2006
 Become most efficient light sources as it
consumes less energy and lifespan is
higher than other
Advantage: colorful
lights and highly
efficient

12. Conclusion
 Natural and artificial lights both are important for daily life
 There are different types of artificial light and basic lighting types
 Artificial Lighting properties can vary the use of light in different
areas
 Energy consumptions of artificial lights are reduced by evolution
 In the end artificial lights are useful in any purpose

13. References
• Thomas Edison facts. (n.d.). Retrieved from
http://thomasedisonfacts.com/
• Lebednik, C. (2009, November 11). How has the Light bulb changed over the years?
https://sciencing.com/lightbulb-changed-over-years-5631574.html
• Enchanted Learning. (2010). The Invention of the Light Bulb: Davy, Swan and Edison
https://www.enchantedlearning.com/inventors/edison/lightbulb.shtml
• Blank, C. (2009, August 13). What Elements Are in Light Bulbs?
https://sciencing.com/elements-light-bulbs-7615670.html

14. THANK YOU !