See also Light Bulbs
Full Spectrum Lighting:
Full spectrum light is a light source with a color temperature of 5000K plus, and a Color Rendering Index (CRI - see below) of 90 plus.
"Many companies have chosen to use term "full spectrum" because people instantly recognize that phrase. However, you can only achieve full spectrum in a fluorescent bulb.
CRI - Color Rendering Index is a measure of how well colors can be perceived using light from a source, relative to light from a reference source such as daylight. By definition, an incandescent lamp has a CRI of 100. Fluorescent lamps with low CRI have phosphors that emit too little red light. Skin appears less pink, and hence "unhealthy" compared with incandescent lighting.
Verilux coined the term natural spectrum and it is meant to describe the quality of the light without being inaccurante."
CRI's typically range from 62-85 for fluorescent bulbs.
Color Rendering Index (CRI) | Topbulb and
High CRI Bulbs | Topbulb
Color Rendering Index (CRI) Explained
Color Spectra or Temperature:
Fluorescent and some LED lights come with different color temperature ratings.
In fluorescent tubes this is done by combining different phospors on the inner surface of the bulb, with LEDs it is done by locating red, green and blue LEDs adjacent to each other.
* Typical Color Temperature (in Kelvin's) or approximate Wavelength (inNanometers)
|Color Name ||Color Temperature * ||Use
|Soft White |
|2,600K - |
|The standard color of incandescent bulbs.
Living rooms and bedrooms: The warm white light is an invitation to relax and enjoy life.
|Warm White |
|Living areas and create a cozy lighting atmosphere.
|Cool White |
|4,100K - |
|Good for kitchens and work spaces.
|6,000K - |
|Good for reading.
the most natural and is ideally suited for lighting private working areas. Studies have shown that artificial daylight has a positive effect on wellbeing and moods and helps to promote concentration.
|Plant or Aquarium |
|647nm to 700nm |
424nm to 491nm
|Plant or Aquarium
Incandescent bulb temperatures: 2800K (60W bulb), 2870K (100W bulb), 2900K (150W bulb)
Philips Lighting - Understanding the new Federal Energy Efficiency Legislation
Color temperature - Color temperature relates to the fact that when an object is heated, it will emit a color that is directly related to the temperature of that object. The higher the color temperature, the more 'blue' the light, and the lower the color temperature the more 'red' the light.
Color temperature in a room or space can have a dramatic affect on the people that use that lighting to perform tasks. For example, rooms that are used for tasks such as reading can benefit by incorporating lighting on the cooler end of the scale. Many studies have been done on classroom and work settings where reading improves when done under lighting near 5500K (Day White - 5500-6000K).
Color temperature - Wikipedia
Color Temperature Tunable White Light LED System
|Color ||Luminous |
(nm / °C)
|Cool White (CW) ||45 ||-- ||3200 K ||--
|Warm White (WW) ||20 ||-- ||6400 K ||--
|Red-Orange (R) ||55 ||20 ||625 ||0.06
|Amber (A) ||42 ||14 ||595 ||0.09
|Green (G) ||53 ||35 ||525 ||0.04
|Blue (B) ||16 ||25 ||465 ||0.04
Color Temperature Tunable White Light LED System.pdf at ssl.xmu.edu.cn
|Color Temperature ||Light Source
|1000-2000 K ||Candlelight
|2500-3500 K ||Tungsten Bulb (household variety)
|3000-4000 K ||Sunrise/Sunset (clear sky)
|4000-5000 K ||Fluorescent Lamps
|5000-5500 K ||Electronic Flash
|5000-6500 K ||Daylight with Clear Sky (sun overhead)
|6500-8000 K ||Moderately Overcast Sky
|9000-10000 K ||Shade or Heavily Overcast Sky
Other Temperature Designations
WW - Warm White - 2700-3500K
W = White 3000-3500K
CW - Cool White - 4000-5000K
P = Full Spectrum 5000-5500K (sometimes shown as 4000-4200)
D - Daylight 6000-6500K (Note: for photography daylight is 5000-5500)
(Note: I couldn't find what P stands for. Some links have P = Black Body or Planckian)
See Color Temperature at light in tech.
CCT - Correlated colour temperature
CRI - Color Rendering Index
Lumen (lm) - Measure of light brightness
Color temperature - Wikipedia
Comparing SoLux and Daylight to Verilux, & Bell+Howell
Full Spectrum (FS) and Seasonal Affective Disorder
1993 American Psychological Association Convention Papers at the Institute for Research in Construction.
The Full-Spectrum Controversy
Full Spectrum Lighting at Dr. Joseph Mercola's Total Health site.
Full Spectrum Lighting -Natural Full Spectrum Lighting Comparisons, Ratings, Reviews at AllergyBuyersClub.com
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last updated 12 Nov 2013