What is Lumen and Watts?
Lumen
Lumen is a unit of luminous flux, which measures the total amount of visible light emitted by a light source.
- Key Points:
- It indicates how bright a light source is.
- Higher lumens mean the light source is brighter.
- It focuses on the amount of light perceived by the human eye.
Example:
- A candle emits around 12 lumens.
- A 60-watt incandescent bulb emits approximately 800 lumens.
Watt (W)
Watt is a unit of power, which measures the rate of energy consumption by a device, including light sources.
- Key Points:
- It tells you how much energy the light source consumes to produce light.
- It does not directly indicate brightness (a 10W LED can be brighter than a 60W incandescent bulb).
Example:
- A 60-watt incandescent bulb consumes 60 watts of power.
- A 10-watt LED uses less power but may emit the same or even more lumens than the 60-watt incandescent.
Why It Matters
- Lumen tells you the brightness of a light source.
- Watt tells you how much energy it uses.
- Choosing energy-efficient light sources (e.g., LED) allows you to achieve high lumens with low watts.
You can convert Lumen to Watts using the following formula: P(W) = ΦV(lm) / η(lm/W)
lumens to watts conversion
Formula: Power (W) Calculation
To calculate the power when luminous flux and luminous efficacy are known:
\[ P = \frac{L}{E} \]
Where:
- \(P\) = Power in watts (W)
- \(L\) = Luminous Flux in lumens (lm)
- \(E\) = Luminous Efficacy in lumens per watt (lm/W)
Example Calculation
If the luminous flux is 800 lumens and the luminous efficacy is 80 lumens per watt:
\[ P = \frac{800}{80} = 10 \text{ watts} \]
Lumens to watts conversion chart
| Lumens | Watts |
|---|
| 100 lumens to watts | Â 1.5 watts (LED) |
| 200 lumens to watts | Â 3 watts (LED) |
| 300 lumens to watts | Â 4.5 watts (LED) |
| 400 lumens to watts | Â 6 watts (LED) |
| 450 lumens to watts | Â 6.75 watts (LED) |
| 500 lumens to watts | Â 7.5 watts (LED) |
| 600 lumens to watts | Â 9 watts (LED) |
| 650 lumens to watts | Â 9.75 watts (LED) |
| 700 lumens to watts | Â 10.5 watts (LED) |
| 750 lumens to watts | Â 11.25 watts (LED) |
| 760 lumens to watts | Â 11.4 watts (LED) |
| 800 lumens to watts | Â 12 watts (LED) |
| 850 lumens to watts | Â 12.75 watts (LED) |
| 1100 lumens to watts | Â 16.5 watts (LED) |
| 1200 lumens to watts | Â 18 watts (LED) |
| 1300 lumens to watts | Â 19.5 watts (LED) |
| 1400 lumens to watts | Â 21 watts (LED) |
| 1500 lumens to watts | Â 22.5 watts (LED) |
| 1600 lumens to watts | Â 24 watts (LED) |
| 1800 lumens to watts | Â 27 watts (LED) |
| 2000 lumens to watts | Â 30 watts (LED) |
| 2700 lumens to watts | Â 40.5 watts (LED) |
| 3000 lumens to watts | Â 45 watts (LED) |
| 4000 lumens to watts | Â 60 watts (LED) |
| 5000 lumens to watts | Â 75 watts (LED) |
| 6000 lumens to watts | Â 90 watts (LED) |
| 10,000 lumens to watts | Â 150 watts (LED) |
| 40 watts to lumens | Â 400 lumens (LED) |
| 60 watts to lumens | Â 600 lumens (LED) |
| 100 watts to lumens | Â 1000 lumens (LED) |
How to use Lumen to Watts Calculator
- Enter Lumens: Input the brightness value (lumens) of the light source.
- Select Light Type: Choose the type of light (e.g., LED, fluorescent) from the dropdown menu.
- Optional Custom Input: If using a custom luminous efficacy, select the “Enter Luminous Efficacy” option and input the value manually.
- Click Calculate: Press the calculate button to get the power in watts.
- View Results: The calculator will display the power consumption in watts.