![]() It also means that when we compare light sources, we need to consider spectral distribution data as well as PPFD. This means that there is no one-to-one relationship between PPFD and spectral distribution. However, because the PPFD is a summation of all photons in the 400-700nm range, two very different spectral distributions can have the same PPFD. Photosynthetically active radiation (PAR), or photosynthetic photon flux density (PPFD), is the range of light that can be used by plants to photosynthesise. In fact, it is less than 1 percent of the total spectrum. ![]() The most important quality of light for plants is its wavelength or energy content the shorter the wavelength the higher the energy content.Īs you can see from figure 1, this is a very small range. That’s because visible light for humans comprises only a small portion of the light spectrum as a whole – namely the range of wavelengths between 400 and 700 nanometres (nm, which is 10-9 m).įigure 1: Light, in the form of electromagnetic waves, is described by the electromagnetic spectrum. When we describe the electromagnetic or light spectrum, it’s better to talk about wavelength than about color. All possible forms of electromagnetic radiation can be described by placing them in the electromagnetic spectrum, see figure 1. It can therefore be described in terms of three physical properties: intensity (or amplitude), frequency (or wavelength) and direction of vibration (polarization). Light is a form of radiation, which takes the form of electromagnetic waves that pass through air or vacuums. In order to explain a plant’s different responses to light, we first need to think about the phenomenon of light itself. All these processes are influenced by the light spectrum, which is the distribution of the light across the electromagnetic spectrum. But in addition to providing energy, light also plays a key role in many other plant processes, such as photomorphogenesis and photoperiodism. Choosing the right lamp can make a huge difference to the quality and quantity of your crop.Įveryone knows that a plant needs light to grow by means of photosynthesis, a process that involves energy fixation and sugar production. We will explain the principles of light and its interaction with plants, and also give you some practical tips. ![]() As we will see, plant development really is something different from plant growth. This article will tell you much more about the effects of light on plant development. Have you ever used grow lamps for your plants? If so, then you’ve probably been amazed by the effect of the light on the development of your plant. ![]()
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