Another feature that allows for dramatic appearance and productivity benefits now and in the future, involves the color temperature of the light produced by LEDs. You can find various types of the best LED lights including Rope Lights, String Lights, Icicle Lights here.
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File: AN002_How to Choose the Right LED Lighting Product Color Temperature
Application Notes
How to Choose the Right LED Lighting
Product Color Temperature
Applicability: All LED Products
LED lighting offers many benefits and features that were difficult, if not impossible to offer with other lighting technologies.
Many of the obvious benefits, such as substantial operating energy and cost reductions, longer life, and lower overall heat
generation are generally well known. Another feature that allows for dramatic appearance and productivity benefits now
and in the future, involves the color temperature of the light produced by LEDs.
Lighting Color Temperature Measurement Beginnings
"White light" is commonly described by its color temperature. Measuring the hue of “white” light started in the late 1800s,
when the British physicist William Kelvin heated a block of carbon. The block of carbon changed color as it heated up, going
from a dim red, through various shades of yellow, all the way up to a bright bluish white at its highest temperature. The
measurement scale for color temperatures, which was named after Kelvin as a result of his work, was based Centigrade
degrees. However, since the Kelvin scale starts at “absolute zero”, which is ‐273°C, you can get the equivalent Centigrade
temperature (compared to the visible colors of a heated black body) by subtracting 273 from the Kelvin color temperature.
Color Temperature Scale Application
The term used
in general
illumination is correlated color
temperature (CCT). CCT relates
to the color of light produced
by a light source, and uses the
Kelvin
temperature
measurement scale (SI unit of
absolute
temperature).
It
describes the relative color
appearance of a white light
source, indicating whether it
appears more
yellow/gold
(“warm”) or more blue (“cool”),
in terms of the range of
available shades of white.
Many people are now familiar
with the idea of a "warm" white
or a “cool” white being offered
by fluorescent and other light
bulbs. These bulbs have vastly
different color temperatures.
The "warm" bulb often has a color temperature of 3,000K and casts a more orange/red light on objects. Because you
normally associate warmth with red or orange objects, this accounts for the "warm" descriptive name, even though it is a
cooler (lower) temperature on the Kelvin scale. A "cool" white bulb commonly has a color temperature of 4,100K and higher
on the Kelvin scale. This is in the low range of blue color, similar to ice, therefore earning the "cool" description.
Basic LED Reference Example
LED Color Temperature Correlation Example
7000K
Kelvin Color Temperature Scale Chart
5700K
4000K
3500K
3000K
2700K
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Copyright © 2010 Seesmart, Inc. All rights reserved.
Web: www.seesmartled.com
File: AN002_How to Choose the Right LED Lighting Product Color Temperature
Application Notes
Retail locations can also benefit with higher temperature lighting from improved appearance of the product graphics and
packaging along with a typically improved feeling of store patrons in the brighter light. Jewelry cases with crystal and
diamonds would do great with Day White (5500‐6000K) light, while wood tones and other jewelry may benefit more from a
Warm (2700‐3200K) or Natural White (4000‐4500K) light. However, bright white lighting may not always be best if a certain
amount of comfort or a particular mood is trying to be generated through the lighting, such as in a restaurant.
Color Temperature and Appearance
Color temperature can affect the way things look in a
space. If the décor is dominated by reds, browns, and
oranges, you may want to illuminate these rooms with
bulbs that have a color temperature in the warm white
(2700‐3000K) range. However, if the space has greens or
blues, bulbs with more neutral to cool color temperatures
(Natural White – 4000‐4500K, Day White – 5500‐6000K, or
Cool White – 6500‐7500K) should be used. If the space
has a mix of colors, natural white (4000‐4500K) bulbs
should be used.
The figure to the right demonstrates basic appearance
differences among the three basic color temperatures.
However, the biggest and most noticeable difference can
be seen between the Warm White and the Cool White
LED lighting color on the same sample device. The red
buttons in the Warm White photo stand out more than in
the Cool White photo, while the blue buttons appear more vibrant in the Cool White example photo.
Color Temperature and Mood
Just as wall finish and paint color can help determine an overall mood in a space, lighting color temperature
can be used to determine and/or enhance a mood. For example, if the space is an intimate restaurant or a
comfortable office setting, warmer color temperature lighting (in the 2700‐3200K range) helps to convey a
glow‐of‐the‐fire type lighting that may be associated with a soothing and calming environment. Conversely,
if a bright and airy environment is the goal, such as in a cafeteria, classroom, lobby, general offices, or certain
retail stores, then cooler color temperature lighting (in the 5500‐6000K range) helps to convey a sunny
daylight type lighting that may be associated with nice pleasing outside conditions.
Color Temperature and Personal Preference
Besides the considerations mentioned above, there is also one more decisive factor that may be used when selecting the
appropriate product color temperature, personal preference. You may simply like or prefer the look of a particular light in a
given space, foregoing any of the advice offered above. Additionally, there is a good chance that you may not have ever
really looked at your lighting, have never cared about it (as long as it turned on every time you needed it), or just want
whatever is up in the ceiling already because it is fine as it is without giving it anymore thought.
Whichever LED lighting color temperature you choose, you will enjoy the lighting and all of the other side benefits for a long
time to come. Contact Seesmart® at 1‐877‐578‐2536 between 9 a.m. to 5 p.m. PST, Monday through Friday or visit
www.seesmartled.com for more information.
Warm White (3000K)
Natural White (4500K)
Cool White (6500K)
Object Appearance Differences with Color Temperature Differences