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When is Warm Lighting Appropriate?
By Bill Lewis
Lighting Expert
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Warm lighting feels more
natural for us in the evenings.
As part of our natural human
circadium rhythm, warm light
seems to relax us and help us
wind down for the say, get
ready for sleep. While cool
lighting helps us be alert and
energetic for performing
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tasks, cool lighting in our
evening spaces may interfere
with our inner clock. We
think of reddish light as
warmer and bluish light as
cooler.
Living room with warm light. Stockbyte / Getty Images
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Warmer light promotes
relaxation.
The color of light is expressed in color
temperature, which relates to the
temperature of a hypothetical black body
would radiate at various temperatures – and,
perhaps confusingly, warmer colors are at
lower color temperatures than cooler colors
are.
Colors on the color temperature scale from
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about 2700-3000K are called warm colors.
These are the reddish or yellowish whites,
and are typical of incandescent lamps.
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Incandescent bulbs emit light based on
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thermal radiation – the heat of the filament –
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so the color temperature is closely related to
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the actual temperature of the filament of the
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bulb.
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produce light at a color temperature of about
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3000K.
Sunset and sunrise typically feature light in the warm color temperature range, a bit lower
in number (about 1800K) than the light of a warm incandescent bulb. Moonlight is a bit
bluer or cooler, in the 4100K range. Candle and match flames are typically in the range of
1700-1900K.
Perhaps warmer colors resonate with us for
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evening because of the color of the evening
hearthside fire. Warm light in the early
morning, as might come in through an
east-facing window, can also be comforting
and help ease us into wakefulness.
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Whatever the reason, you can create the
effect of warmth and comfort through lighting
in the “warm” range.
Most of us do that with separate lighting
sources. We open the curtains or blinds during the daytime and let the early morning
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warm sunlight, then later the cool natural daylight in. Then at night, we have used
incandescent lighting and maybe a fireplace to produce that warmer ambient lighting. If
we want to read, we may have a fixture that throws cooler light on the screen or page.
As we age, the lens of our eyes can become slightly yellowed, and we see colors as
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warmer. Balancing warm light with more cool light is helpful as we age.
Warm colors in a room tend to change our perception of color of objects within the room
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from how they would look in daylight. If your room is lit with mostly warm light, be sure to
check out any furniture or other decor you're considering under a similar light, to avoid
unpleasant surprises.
Too much warm light can tend to be a bit soporific, and make it harder to focus on specific
tasks. That's why many office spaces are lit with cooler lights instead.
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color of that shade or filter will change the color of the light.
Where Should I Use Warm Light?
Consider not just the choice between warm or cool light, but where and when to use each.
You will likely want some mixture of cool and warm light in a space, and it's especially
helpful to have separate controls for "scenes" that require different ambiance.
Warm, or soft white, light, is especially appropriate for cozy living spaces where we want
to relax and be comfortable. Use it to simulate evening or very early morning light. Use
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cooler lighting for tasks that require a lot of focus. Warm lights look better in many period
rooms, and especially those with warm colors in them.
A warm white bulb is the common choice to replace older incandescents.
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