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Convert between Exposure Value (EV) and Lux for precise light measurement
Lux Result
2560.00 lx
Formula: Lux = 2.5 × 2EV | EV = log₂(Lux / 2.5)
| EV | Lux | Typical Condition |
|---|---|---|
| EV -4 | 0.16 lx | Night, no moon |
| EV 0 | 2.50 lx | Dim ambient light |
| EV 4 | 40.00 lx | Living room lighting |
| EV 8 | 640.00 lx | Office lighting |
| EV 10 | 2560.00 lx | Overcast day |
| EV 12 | 10240.00 lx | Bright overcast |
| EV 14 | 40960.00 lx | Sunny day (shade) |
| EV 15 | 81920.00 lx | Sunny day (direct) |
| EV 16 | 163840.00 lx | Very bright sun |
Exposure Value (EV) and Lux are both measurements of light, but they serve different purposes in photography and lighting.
Exposure Value is a logarithmic scale that combines aperture and shutter speed into a single number. Each increment of 1 EV represents a doubling or halving of light. EV is commonly used in photography to describe scene brightness and to set exposure compensation.
Lux is the SI unit of illuminance, measuring the amount of light falling on a surface. One lux is equal to one lumen per square meter. Light meters measure illuminance in lux, making it a practical unit for lighting professionals and photographers.
EV uses a logarithmic scale because our eyes perceive light logarithmically. Each EV step represents a doubling or halving of light, which makes it easier to work with the wide range of light levels encountered in photography.
Yes, you need a light meter or lux meter to accurately measure illuminance. Some smartphone apps can approximate lux readings, but dedicated light meters provide more accurate measurements.
The formula provided assumes ISO 100. At different ISO settings, the relationship changes. Higher ISO values allow you to shoot at higher EV numbers (darker conditions) with the same lux level.
Lumens measure total light output from a source, while lux measures illuminance on a surface. The relationship is: 1 lux = 1 lumen per square meter. The same light source produces fewer lux as distance increases.