Daylight Bulbs vs. Bright White

Kelvin Scale

• The Kelvin Scale is a system used to measure and describe the color of light. Yellow light is represented by a low number on the scale, and bright white light is represented by a high number on the scale. Of course, a range of light is between yellow light and bright white light. Standard incandescent light bulbs measure between 2,700 and 3,000 on the Kelvin Scale.

Daylight Bulbs

• Energy Star-qualified bulbs are considered daylight bulbs if their Kelvin Scale rating is in the 5,000 to 6,500 range. These bulbs are recommended for reading and other applications where light should be plentiful but also subtle.

Bright White Bulbs

• Bright white bulbs are considered to be in the 3,500 to 4,100 range on the Kelvin Scale. These bulbs put off a very crisp, white light that is desirable for areas such as kitchens, bathrooms and work spaces. This light can appear too harsh in areas such as living rooms or reading areas, and it can strain the eyes if used for direct lighting in offices.

Other Considerations

• When selecting a light bulb and light type, consider the fixture in which it will be installed. If the filter has tinted or opaque glass, it may affect the color of light emitted by the bulb. Select light bulbs that are compatible with the desired fixture in terms of wattage, shape, size and dimming support, too.