Chlorosis from high light intensity most seriously affects shade plants unaccustomed to high light. Their cell walls and leaf blades are thin, and sensitive to light and water stress. Example of High light and heat damage. This primarily affects root growth so that plants that are not adapted to low light produce weak root systems. This can increase problems when the plant is exposed to higher light and the roots cannot meet the demands for water uptake.
Continuous light can damage plants creating chlorosis, necrotic lesions or faint mottling.
The effects of an extended photoperiod can be seen in some situations either in an interiorscape or in areas where there may be night lighting from street lamps.