EQUATOR LIGHT INTENSITY FULL

Maximum intensity occurs at the equator, and gradually decreases with increasing distance from the equator to the south and north poles. It gradually increases from sunrise to the middle of the day and then gradually decreases toward sunset it is high during summer, moderate in spring and fall, and low during winter time. The intensity of light can change with the time of the day, season, geographic location, distance from the equator, and weather.

EQUATOR LIGHT INTENSITY FULL

Some terms that are used with reference to light intensity are open or full sun, partial sun or partial shade, and closed or dense shade.īased on adaptation, crops can be classified as sun plants and shade plants with various intergrades in between. High light intensity means it is brighter compared to low light intensity. The following intensity values in footcandle are given for some light conditions (Janick 1972): starlight – 0.0001, moonlight – 0.02, indoors near window – 100, overcast weather – 1000, direct sunlight – 10,000. To convert the intensity of light from the sun, for instance, 800 μmol m -2s -1 to footcandle, 800 is multiplied by 5 which results to 4,000 fc.Īnother unit of measurement is the mol m -2d -1 which describes the total number of photons received by an area of 1 sq meter in 24 hours. It describes the number of photons of light within the photosynthetic waveband that an area of 1 sq meter receives per second. However, the units footcandle and lux are merely based on visual sensitivity and do not provide information on the energy or photon content of light.Īccording to Runkle (2006), the better unit of light intensity for studies involving plant responses is the μmol m -2s -1. Two adjacent plants may have differential light exposure

Equator light intensity