What is color temperature?

“Lumens” is the unit of measurement for the brightness of a light. Don’t confuse this with “wattage”, which is the unit of measurement for the electricity consumed by a light. If you’re used to incandescent bulbs, you probably use “lumens” and “wattage” interchangeably. But an LED fixture with the brightness of a “40 Watt” incandescent light uses much less electricity that 40 Watts.