<P> Multiplying the figure of 1050 watts per square metre by 93 lumens per watt indicates that bright sunlight provides an illuminance of approximately 98 000 lux ( lumens per square meter ) on a perpendicular surface at sea level . The illumination of a horizontal surface will be considerably less than this if the Sun is not very high in the sky . Averaged over a day , the highest amount of sunlight on a horizontal surface occurs in January at the South Pole ( see insolation ) . </P>
<P> Multiplying the figure of 1050 watts per square metre by 93 lumens per watt indicates that bright sunlight provides an illuminance of approximately 98 000 lux ( lumens per square meter ) on a perpendicular surface at sea level . The illumination of a horizontal surface will be considerably less than this if the Sun is not very high in the sky . Averaged over a day , the highest amount of sunlight on a horizontal surface occurs in January at the South Pole ( see insolation ) . </P>
how much light does the sun give off
how much light does the sun give off
approximately 98 000 lux ( lumens per square meter )
approximately 98 000 lux ( lumens per square meter )