Color Temperature

Color Temperature is indicated in units called Kelvin and its value determines whether light bulbs produce warm or cold light. This guide shows how LED and energy-saving light bulbs can have different color temperatures.

Related How Tos

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Color Rendering Index

See how a high color rendering index makes colors appear natural.


Wide and focused light

See how the shape of a bulb has a big impact on the light effect it delivers.


Watt and lumen

Learn more about the difference between watt and lumen and what it says about a bulb.


Amount of Light

See how lumen indicates the amount of light that a bulb produces.


Base type

Learn about the differences between base types and how to pick the right one for your light fixture.