Illuminance Converter — Free Online Unit Converter | No Signup
The Illuminance Converter is a free online tool designed to effortlessly switch between different units of illuminance, such as lux and foot-candles. This is essential for professionals and hobbyists in fields like lighting design, photography, agriculture, and interior design who need precise light level measurements.
How to use the Illuminance Converter
- Select the unit you want to convert from in the first dropdown menu.
- Select the unit you want to convert to in the second dropdown menu.
- Enter the illuminance value you wish to convert in the provided input field.
- The converted value will be displayed automatically in the result field.
Understanding Illuminance Units
Illuminance is a measure of how much luminous flux (light) falls on a given surface area. It's crucial for ensuring adequate lighting conditions for various tasks and environments. The two most common units for measuring illuminance are lux (lx) and foot-candle (fc).
Lux (lx) is the SI unit of illuminance, defined as one lumen per square meter (lm/m²). It is widely used internationally.
Foot-candle (fc) is an imperial unit of illuminance, defined as one lumen per square foot (lm/ft²). It is commonly used in the United States and some other countries.
The conversion between these two units is straightforward:
- 1 lux = 0.0929031 foot-candles
- 1 foot-candle = 10.7639 lux
Here's a quick reference table for common illuminance levels:
| Description | Lux (lx) | Foot-Candles (fc) |
|---|---|---|
| Absolute Darkness | 0 | 0 |
| Starlight | 0.002 | 0.0002 |
| Full Moon | 0.1 - 0.5 | 0.009 - 0.046 |
| Street Lighting (residential) | 5 - 20 | 0.46 - 1.86 |
| Office Desk Lighting | 300 - 500 | 27.9 - 46.5 |
| Reading Light | 500 - 750 | 46.5 - 69.7 |
| Retail Store Lighting | 500 - 1000 | 46.5 - 92.9 |
| Operating Room | 1000 - 2000 | 92.9 - 185.8 |
| Direct Sunlight (clear day) | 32,000 - 100,000+ | 2,973 - 9,290+ |
Frequently Asked Questions
What is illuminance and why is it important?
Illuminance is the measure of the amount of visible light that falls on a surface. It is crucial for ensuring that spaces are adequately lit for specific tasks, promoting visual comfort, safety, and productivity. For example, insufficient illuminance can lead to eye strain and errors, while excessive illuminance can cause glare and discomfort.
What is the difference between illuminance and luminous flux?
Luminous flux, measured in lumens (lm), is the total amount of visible light emitted by a source. Illuminance, measured in lux (lx) or foot-candles (fc), is the amount of luminous flux that falls on a specific unit of area. Think of luminous flux as the total output of a light bulb, and illuminance as how brightly that light illuminates your desk.
Can I convert lux to foot-candles and vice versa using this tool?
Yes, absolutely. The Illuminance Converter is designed to handle conversions in both directions. You can choose lux as your starting unit and convert to foot-candles, or choose foot-candles and convert to lux, with just a few clicks.
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