Watt and lumen

Watt indicates the amount of power a bulb uses to provide light, while lumen is the unit used to measure the light output of a light bulb. This guide shows how LED and energy-saving light bulbs require less power to emit the same amount of light as a classic bulb and what to look for on Philips packaging.

Related How Tos

previous next


Base type

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


Amount of Light

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


Wide and focused light

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


Color Temperature

See how color temperature determines if a bulb produces warm or cool light.


Color Rendering Index

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