How much light intensity does orchid cultivation require?

Using an appropriate light intensity is extremely important forcultivatingorchids. Generally, a 50% shade net is used, and for some shade-loving varieties a 70% shade net can be used. Based on the ecological conditions of the native habitats of orchids, it can be known that some orchid species can grow while receiving direct sunlight; some orchid species grow under tree shade, but most orchids are suitable for growing under half-day shade. For example, Vanda, Phalaenopsis, Cattleya, and Oncidium are suitable for relatively strong sunlight; Paphiopedilum, Miltonia, and Phaius prefer weaker light, whileCymbidiumhas a relatively wide range of adaptability, and can becultivatedwhether under strong light or half-day shade, but under too strong sunlight it is easily sunburned, and under too weak light it is very difficult to form flower buds. Experiments have shown that shade-loving orchids can meet the requirements of photosynthesis at an intensity of 10,000 to 20,000 lux, and sun-loving orchids at an intensity of 30,000 to 50,000 lux. Therefore, as far as the photosynthesis of orchids is concerned, a light intensity of 20,000 to 50,000 lux is the most suitable. In most regions of China, 50% to 70% shading is needed in summer; 20% to 50% shading is needed in spring and autumn; and no shading is needed in winter. (Lin Deqing, Mu Wei)