First, a quick refresher: photosynthesis is a process used by plants to convert light energy, usually from the Sun, into chemical energy, in the form of a sugar, that can be stored and used later as food for the plant. Try to imagine the plant leaf almost like a mini solar panel. The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf and chlorophyll, the pigment in green plants, absorbs the solar energy. The products of photosynthesis are sugar and oxygen. Here is a simple diagram to help explain:<\/p>\n
![\"Photosynthesis\"](\"https:\/\/www.newprocontainers.com\/blog\/wp-content\/uploads\/graphic.png\")
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Insufficient lighting is the most frequent cause of living wall failures.<\/strong> We know that lack of light results in unhealthy looking plants, but it also causes the plants to stop drinking water. Because the plants stop drinking, excess water builds up in the soil and creates a toxic anaerobic environment. This damp soil downs the plants and causes root rot. It is also a fertile environment for soil-borne pathogens, molds and bugs, which can further compound the problem.<\/p>\n Since insufficient lighting can lead to a host of nasty problems, it’s imperative that we learn how to properly light a living wall. To do this, we need to understand the different types of light, how to measure light intensity, light quality and how to select the right light bulbs. The science behind can be complicated, so here’s the synopsis for those of you short on time:<\/p>\n Light is actually just waves of electromagnetic radiation. There is a wide range of electromagnetic radiation including X-rays, Microwaves and FM\/AM radio waves. What we refer to as light is the portion of these waves which is visible to the human eye. Visible light has a wavelength in the range of 400 nanometres (nm) to 700 nanometres \u2013 between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).<\/p>\n Visible white light is actually a composition of many different colors of light (think of a rainbow), with the primary colors being blue, green and red. Photosynthesis depends upon the absorption of blue and red light by the chlorophyll pigments in the leaves of plants (this is why plant grow lights are red and blue). Plants appear green to us because they do not absorb the green light, so that green light is reflected off the leaves and into our eyes.<\/p>\n However, lux and foot-candle light meters are meant for measuring the amount of light as seen by humans. They can be used as a rough guide for lighting levels, but they don\u2019t actually tell us anything about how plants will respond.<\/p>\nWhat is Light? <\/strong><\/h3>\n
Types Of Light<\/strong><\/h3>\n
![\"Types](\"https:\/\/www.newprocontainers.com\/blog\/wp-content\/uploads\/Types-of-Light.png\")
<\/p>\nMeasuring Light Intensity<\/strong><\/h3>\n
![\"Light](\"https:\/\/www.newprocontainers.com\/blog\/wp-content\/uploads\/Light-Intensity.png\")
Light intensity refers to the total amount of light, or the degree of brightness, that a light source emits. The intensity of light is usually measured in lux or foot-candles. Light intensity can be easily measured with any off the shelf light meter and there are many guides for what is the desired lux or foot-candles by plant type. Your eyes cannot accurately estimate light intensity levels, so you need to buy a light meter. In general, it’s pretty difficult to have too much light in indoor conditions, so my opinion is that more is almost always better.<\/p>\n