# Visual Sensory

## Illuminance (lux) and Brightness (nits)

* Illuminances produced by daylight cover a broad range, from 150,000 lux on a sunny day in the summer to 1,000 lux on a gray, overcast day in winter. The typical illuminance that results from moonlight is about 0.3 lux.

* Illuminance value for a typical home or office is between 300 to 500 lux (30 to 50 footcandles).

* Smartphone screen = ~500–2,000 nits (cd/m²) (1 nit = π lux ≈ 3.14 lux)

* Sunlight on a surface = ~100,000 nits

* A white wall lit by a 60W bulb = ~50–100 nits depending on distance

{{::illuminance_chart.png|}}

## Can a 1000 nits smartphone screen be seen in a 3000 lux environment

{{::lcd_screen_readablility_in_sunlight.png?600|}}
{{::readability_and_contrast_ratio.png?600|}}