Prologue Houseplants extremely bad luck: they had to grow indoors. The most lucky plants accrue bright windowsills, and proximity in relation to light – this is, rather, an analog of the bush under the elevated tree when the sun falls just a morning or afternoon, and then – scattered trees. Typical plants in indoor environments is extremely not enough light (and not only in winter but in summer), but not god knows how many of the world – there is no form, no growth, no flowering. Sometimes the plants are grown entirely without daylight – only by artificial light (lamps, in particular: in a room where there is no window openings (Windows) or if the plants are growing away from the window). What you should know Lumens and suites are often confused.
These values are units of light and lighting, what is necessary to distinguish. Electric power lamp is measured in watts (W), and the luminous flux (‘power of light’) – in lumens (lm). The greater the number of lumens, the more light that emits light. This is similar to a hose for watering plants – more than were open tap, the ‘syree’ will all circle. Luminous flux characteristics of the light source and light – the surface on which light falls.
Again, by analogy with the hose – you need to see how much water gets into one or another point. From this will depend on how long you should water the plants. Illuminance measured in lux (lx). Light source with a luminous flux of 1 lm uniformly illuminating the surface area of 1 square. m, forms a light on it at 1 lux. Useful tips on the surface illumination is inversely proportional to the square of the distance from the light source to the surface. If you have moved the light source (such as a lamp), who was above the plants at a height of 50 cm, height of 1 meter from the plant, raising similar manner, the distance between them 2 times – the illumination of plants fall into 4 times. On this we must not forget when you are designing a system for lighting plants. Lit surface also depends on the angle, what under the covers this surface. For example: the solar disk on a summer day, lying high in the sky, forms on the planet’s surface brightness is several times greater than the solar disc, low-hanging over the horizon on a winter day. If you use to cover plants such as lamp floodlights (flood), it tends to light was oriented perpendicular to the plants.