Humphrey Davy created the first electric light in 1800 using an arc lamp with wires connected to a battery and piece of coal. Thomas Edison later invented the first practical light bulb in 1879 using a carbon filament inside an oxygen-free glass bulb that lasted 40 hours. Over the years, improvements were made such as adjustable power beams, fluorescent lighting, halogen bulbs, and the first LED in the 1940s-50s to make lighting more efficient and eco-friendly.

1. LightBulbs
By Md. Liakat Ali
Student ID:-1401611200742

2. When was the first light bulb invented?
• Thomas Edison created the first light bulb
in 1879.
• BUT, Humphrey Davy created the first light
in 1800.

3. Who invented the first light bulb?
• Humphrey Davy created the first light
using an arc lamp.
• The arc lamp took to much power for
use in residential houses.
• They use arc lamps in lighthouses
because they are super bright.
• Edison bought the idea of the light bulb
from to inventors and patented it.

4. What materials were originally used to
make the light bulb?
• Humphrey Davy connected wires to a
battery and a piece of coal, which
made an intense spark. This became
known as the electric arc lamp.
• Thomas Edison then used a filament
housed in a glass vacuum bulb. He
then passed electricity through this
which lit the bulb.

5. How was Edison’s light bulb originally
made?
• Edison used a carbon filament
that burned for forty hours.
• The carbon filament was put
in an oxygen-less glass bulb.

6. What improvements to the light bulb
have been made over the years?
• 1920s-1930s:Adjustable power beam bulbs, fluorescent
lighting, and one time flash bulbs.
• 1940s-1950s: Halogen and infrared light, and the first light
emitting diode (LED).
• 1960s: The increase in the efficiency and capacity of LED
technology.
• The Late 20th and Early 21st Centuries: The first full
spectrum and near-full spectrum light bulbs.

7. Why were such improvements made?
• 1920’s-1930’s: Most improvements were made mainly
to improve photography technology
• 1940’s-1950’s: Improvements made to invent the first
LED lights.
• 1960’s: Improvements to the LED light bulbs and flash
lights to make them more efficient.
• The late twentieth and early 21’st centuries:
Improvements made to be more eco-friendly and better
the marketing of full spectrum incandescent light bulbs.

8. Partes of the Bulb
1. Outline of Glass bulb
2. Low pressure inert gas (argon,
neon, nitrogen)
3. Tungsten filament
4. Contact wire (goes out of stem)
5. Contact wire (goes into stem)
6. Support wires
7. Stem (glass mount)
8. Contact wire (goes out of stem)
9. Cap (sleeve)
10.Insulation (vitrite)
11.Electrical contact

9. LED Lighting-Energy Saving Technology for
Generation to Come