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Guide for LED Light Fixtures: Understanding Lumens, Watts, and Voltage

Guide for LED Light Fixtures: Understanding Lumens, Watts, and Voltage

Posted by Bulb Basics on Jul 22nd 2019

Lumens, Watts & Voltage

Guide for LED Light Fixtures: Understanding Lumens, Watts, and Voltage


Lumens are a measurement of visible light energy. More lumens emit a brighter light. All  lighting manufacturers are starting to label how many lumens are produced for each of their lighting products. Flood Light - 30 Watts - 150 Watts Equivalent - 3900 Lumen DLC Listed


Watts measure energy consumption. When we pay our electric bill, we pay for the number of watts we use. A 60-watt bulb consumes 60 watts of energy, but the lumen output depends on the type of bulb.


Voltage measures the output of  electrical current. The higher the voltage, the greater the power. In the USA voltage typically ranges between AC100-277V, and AC210-480V for high voltage systems.

Water Pipe Analogy

Lumens from Light Source Watts

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Q. Can I use a higher wattage LED bulb in a fixture with a lower wattage rating?

It's generally safe to use a lower wattage LED bulb in a fixture rated for higher wattage. However, the opposite can cause overheating and damage to the fixture.

Q. How do lumens compare to watts in LED bulbs?

- Watts measure energy consumption, while lumens measure brightness. In LED bulbs, you can't rely on watts to determine brightness because LEDs are more energy-efficient than traditional bulbs. Use lumens instead.

Q. How can I calculate the number of LED bulbs needed for a room?

- To determine the number of bulbs, consider the room size, desired brightness (in lumens per square foot), and the lumens rating of the LED bulbs you plan to use. Divide the total lumens needed by the lumens per bulb to find the quantity required.

Q. What are lumens in LED lighting?

- Lumens are a measurement of the total visible light output produced by an LED bulb. It represents how bright the bulb will be.

Q. Why is it essential to match the voltage of LED bulbs with my fixtures?

- Mismatched voltages can cause LED bulbs to flicker or burn out prematurely. Always ensure the bulb's voltage matches the voltage of your fixtures.