1800 Lumens to Watts – Answer and Calculator Tool

1800 lumens is approximately equal to 15 watts when using a typical LED light conversion rate.

Converting lumens to watts depends on the type of light source, since lumens measure brightness and watts indicate power consumption. For LED bulbs, about 120 lumens per watt is a good average to estimate watts from lumens.

Conversion Tool

Conversion Formula

The formula to convert lumens to watts depends on the efficiency of the light source. For LED bulbs, the average luminous efficacy is about 120 lumens per watt. So the formula is:

Watts = Lumens ÷ Lumens per Watt

This formula works because lumens measure the visible light output, while watts measure power usage. Dividing lumens by the efficiency (lumens/watt) gives the power consumed to produce that brightness.

Example: For 1800 lumens:

• Watts = 1800 ÷ 120
• Watts = 15

Conversion Example

• Convert 2400 lumens to watts:
  • Divide 2400 by 120 (efficiency)
  • 2400 ÷ 120 = 20 watts
  • So, 2400 lumens equals 20 watts
• Convert 900 lumens to watts:
  • 900 ÷ 120 = 7.5 watts
  • This means 900 lumens uses about 7.5 watts power
• Convert 1500 lumens to watts:
  • 1500 ÷ 120 = 12.5 watts
  • This is the power for a 1500 lumen output
• Convert 3000 lumens to watts:
  • 3000 ÷ 120 = 25 watts
  • So 3000 lumens corresponds roughly to 25 watts

Conversion Chart

The chart shows lumens values increasing by five and the equivalent watts based on dividing by 120. To find the watts for a value between these, interpolate or use the formula directly.

Related Conversion Questions

• How many watts does a 1800 lumen LED bulb use?
• What is the wattage equivalent for 1800 lumens in incandescent bulbs?
• Can 1800 lumens be produced by a 20 watt light source?
• How to convert 1800 lumens to watts for different bulb types?
• Is 1800 lumens brighter than 15 watts?
• What watt rating corresponds to 1800 lumens in CFL lights?
• Does 1800 lumens always equal the same watts in LED and halogen bulbs?

Conversion Definitions

Lumens: Lumens measure the total quantity of visible light emitted by a source. It quantifies brightness perceived by human eyes, not energy used. More lumens means brighter light. It is a unit used to compare actual light output of lamps and bulbs.

Watts: Watts indicate power consumption or energy use per second. It measures the rate of energy transfer, not brightness directly. In lighting, watts tells how much electricity a bulb uses to produce light, heat, or other forms of energy.

Conversion FAQs

Why does the watt value change for the same lumen output between LED and incandescent bulbs?

Different light sources have different efficiencies in producing light from power used. LEDs convert more electricity into visible light, so they use fewer watts for the same lumens compared to incandescent bulbs which lose more power as heat.

Is the 120 lumens per watt conversion accurate for all LED bulbs?

No, 120 lumens per watt is an average. Some LEDs can be more efficient (up to 150 lumens/watt or more), while cheaper or older models may produce fewer lumens per watt. The exact wattage depends on the specific bulb’s technology and quality.

Can I use lumens to estimate electricity cost from wattage?

Indirectly, yes. Since watts measure power consumption, knowing lumens alone is insufficient to calculate electricity cost. You must convert lumens to watts using an appropriate efficiency value, then multiply by usage time and electricity rate to estimate cost.

Does converting lumens to watts work for all light colors?

Luminous efficacy varies slightly with color temperature and spectrum. Some colors or types of LEDs may have different lumens per watt ratios. So the conversion might be less precise for colored lights compared to white light sources.

What happens if I use the wrong lumens per watt value for conversion?

Using an incorrect lumens per watt value results in inaccurate wattage estimates. This could lead to choosing bulbs with wrong power ratings, affecting energy cost predictions or electrical load calculations.