Dec 22, 2017

KNOW BEFORE BUYING LED BULBS ( LESSON :2)

 know before buying LED Bulbs ( LESSON :2)

  • Color temperature refers to the light’s color characteristics.
  • Color Temperature is measured in Kelvin.
  • It refer to the warmness or coolness of the light that bulb produces.
  • The color temperature of a light source is a numerical measurement of its color appearance.
  • This temperature is based on the principle that any object will emit light if it is heated to a high enough temperature and that the color of that light will shift in a predictable manner as the temperature is increased.
  • Color temperature is a description of the warmth or coolness of a light source. When a piece of metal is heated (temperature increases) the color of light it emits will change. This color begins as red in appearance and graduates to orange, yellow, white, and then blue-white to deeper colors of blue.
  • Color Temperature is not an indicator of lamp heat.
  • The sun, for example, rises in morning at approximately 1800 Kelvin and changes from red to orange to yellow and to white as it rises to over 5000 Kelvin at high noon. It then goes back down the scale as it sets in evening.
  • The warm white ranges from about 2700k to 3800k, natural white ranges from 3800k to 4800k, pure white or daylight from about 4800k to 6000k. Cool white starts from around 6000k upwards.
  • Colors and light sources from the red/orange/yellow side of the spectrum are described as warm (incandescent) and those toward the blue end are referred to as cool (natural daylight).
  • In Color Temperature Value higher Kelvin temperatures (3600–5500 K) are consider cool and lower color temperatures (2700–3000 K) are considered warm.
  • When choosing a color, the two considerations are important one is color rendering (How well the light shows the true color of objects) and temperature.
(1) Soft White / Warm White (2700K- 3000K):
  • Warm light is preferred for living spaces because it is more flattering to skin tones and clothing.
  • Recommended for indoor general and task lighting applications.
  • Living rooms
  • Bed rooms
  • Rooms decorated in earthy tones (reds, oranges, and yellows)
  • It gives effect like incident or halogen Light.
(2) Natural / Cool White (3500K- 4500K):
  • Cool light is preferred for visual tasks because it produces higher contrast than warm light.
  • Recommended for use in Domestic Applications.
  • Warmer Whites are preferable in living and dining areas as well as reception areas to create a more relaxed environment.
  • Natural Whites are preferable for kitchens and bathrooms where tasks are performed.
  • Suitable for work areas where contrast is important.
  • Kitchen
  • Bath rooms
  • Rooms decorated in airy, fresh hues (blues, greens, whites)
  • It gives effect like Fluorescent Light.
(3) Bright White (4500-5000K):
  • Recommended for use in:
  • Office
  • Study Room
(4) Daylight / Full Spectrum (5000K- 6500K):
  • Recommended for use in:
  • Garage
  • Office
  • Industrial and hospital areas.
  1
                                                         Lighting Source CCT
SourceColor temperature in Kelvin
Skylight (blue sky)12,000 – 20,000
Average summer shade8000
Light summer shade7100
Typical summer light (sun + sky)6500
Daylight fluorescent6300
Xenon short-arc6400
Overcast sky6000
Clear mercury lamp5900
Sunlight (noon, summer, mid-latitudes)5400
Design white fluorescent5200
Special fluorescents used for color evaluation5000
Daylight photoflood4800 – 5000
Sunlight (early morning and late afternoon)4300
Brite White Deluxe Mercury lamp4000
Sunlight (1 hour after dawn)3500
Cool white fluorescent3400
Photoflood3400
Professional tungsten photographic lights3200
100-watt tungsten halogen3000
Deluxe Warm White fluorescent2950
100-watt incandescent2870
40-watt incandescent2500
High-pressure sodium light2100
Sunlight (sunrise or sunset)2000
Candle flame1850 – 1900
Match flame1700
Skylight (blue sky)12,000 – 20,000
Average summer shade8000
Light summer shade7100
Typical summer light (sun + sky)6500
Daylight fluorescent6300
Xenon short-arc6400
Overcast sky6000
Clear mercury lamp5900
Sunlight (noon, summer, mid-latitudes)5400
Design white fluorescent5200
Special fluorescents used for color evaluation5000
Daylight photoflood4800 – 5000
Sunlight (early morning and late afternoon)4300
Bright White Deluxe Mercury lamp4000
Sunlight (1 hour after dawn)3500
Cool white fluorescent3400
Photoflood3400
Professional tungsten photographic lights3200
100-watt tungsten halogen3000
Deluxe Warm White fluorescent2950
100-watt incandescent2870
40-watt incandescent2500
High-pressure sodium light2100
Sunlight (sunrise or sunset)2000
Candle flame1850 – 1900
Match flame1700
 2
                                CCT – Correlated  Color  Temperature
KelvinAssociated EffectsType of BulbsAppropriate Applications
2700°Warm White, Very Warm Whiteincandescent bulbsHomes, Libraries, Restaurants
3000°Warm Whitemost halogen lamps, Slightly ‘whiter’ than ordinary incandescent lampsHomes, Hotel rooms and Lobbies, Restaurants, retail Stores
3500°WhiteFluorescent or CFLExecutive offices, public reception areas, supermarkets
4100°Cool WhiteOffice, classrooms, mass merchandisers, showrooms
5000°DaylightFluorescent or CFLGraphic industry, hospitals
6500°Cool DaylightExtremely ‘white’Jewelry stores, beauty salons, galleries, museums, printing

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