Understand Light! | Definition,Types..etc

Light

Definition- "Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum."

Types of light- Indoor and Outdoor Lighting

Indoor Lighting

Some of the most common indoor light bulbs are incandescent bulbs, which look like a

traditional light bulb.

Incandescent Bulbs

The incandescent light bulb has had the same design for over 100 years since Thomas Edison invented it! It produces light when a thin wire called a tungsten filament is heated by electricity running through it making it so hot that it starts to glow brightly. This releases a lot of heat and the bulbs get hot to the touch, meaning this bulb is very inefficient

CRI: 100
Wattage: 40, 60

Lumens: 290, 840

Compact Fluorescent Light Bulbs (CFL)

Compact Fluorescent Light bulbs (CFLs) work by running electricity through the gas inside the coils, exciting that gas, and producing light. There is a coating on the spirals, which makes this light white. These bulbs do not get nearly as hot as the incandescent bulbs.
CRI: 50-80
Wattage: 9, 13

Lumens: 550, 810

Light Emitting Diode (LED)

LEDs that produce white light work in a rather complicated way. While these are the most efficient bulbs to date, they are not without problems. Although the light they produce looks white, remember
that white light contains all the colors of the rainbow.LEDs contain a lot of blue light, too much of which can have negative effects on human health and wildlife.
CRI: 80-98
Wattage 6, 9.5
Lumens 450, 800

Outdoor Lighting

There are many different kinds of light bulbs used outdoors, and they

each has pros and cons.

Halogen Bulbs

Halogen bulbs are often found in homes as spotlights or floodlights, in cars as headlights, or at sports fields as stadium lights. When the tungsten burns off the filament, the gas re-deposits it back onto the filament to be reused. Halogen bulbs last much longer than incandescent, but these bulbs are much brighter and burn much hotter than traditional incandescent bulbs.

CRI: 100

Wattage 53, 72, 75

Lumens 940, 1350, 150

Metal Halide 

They are very bright and contribute to a lot of light pollution. They are fairly efficient. They produce
very white light and have good color rendition, meaning that objects under these lights look their true color.
CRI: 85-94
Wattage 250, 400, 1000

Lumens 22,000, 36,000, 110,000

Low-Pressure Sodium (LPS)

The low-pressure sodium (LPS) lamp works similarly to the HPS light. Instead of producing white light. LPS lamps produce almost exclusively yellow light. While this light is fairly efficient,
it takes several minutes for the bulb to turn on. The light is very yellow-orange. This yellow light makes objects it is illuminating to look a different color or gray.
CRI: -44
Wattage 18, 35, 55
Lumens 1800, 4550, 7800