Fluorescent “Grow lights” are more expensive than they are worth.Incandescent lights lack blue, and add too much heat.Sunlight has all the right parts of the spectrum.Photosynthesis required red and blue light.Plants are generally divided into long day, short day and day neutral when describing initiation of flowering.If the light in the house is a bit low longer hours of illumination can compensate.Most plants need some darkness at night 3-4 hours.The southern exposure also generates the most heat followed by W, then E, then N.In a Duluth house, the south windows with have the strongest sunlight, E and W = 60% and N=20%.Houseplants are listed as High, medium or low light, and some plants can be in several categories.Curtains, trees in the landscape, uv filters on windows, weather, season, cleanliness of the glass, low E glass, paint color of the room….Factors that influence intensity of sunlight.1 foot candle is the light cast by a standard candle at the distance of 1 foot.
Light intensity is measured in Foot Candles, Lux or Lumens.Flowering usually depends on light levels and day length.The brighter the light the more color develops in leaves ( coleus, begonia).When grown in too little light plants will be etiolated (spindly).All green living plants need light to grow.Light descriptors: intensity, duration, quality.Temperature – warmer days cooler nights ( tropic to subtropic).Nutrients- match to the needs of the plant and time of year.Light - most houseplants are understory plants.Environmental factors affecting plant growth
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