Indoor Plant Lighting
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Once plants begin to form fruits and flowers they need light from the red/orange spectrum. This again is to mimic nature as these stage in plant development usually occur well into summer where the sun is high in the sky and the light is warm in spectrum.
In practical terms it is often best to choose an all-round grow light that can cater for all growth stages, but for the best results you may wish to consider different lamp types for different stages of growth.
As well as spectrum, you also need to consider light type and the intensity of light that is required.
For young plants (that require blue light) there are many fluorescent lighting systems that are suitable, but these indoor plant lights may struggle once the plants become larger in size. That said though, if you are growing something relatively small such as lettuce, then a fluorescent light would be ideal.
If you want to grow plants that become larger and have more dense foliage then a more powerful light source will be required to give sufficient canopy penetration.
High Intensity Discharge lights are used in most commercial greenhouses around the world, and these systems can also be used on a smaller scale in indoor growing. These are typically available to power two types of lamp, metal halide lamps (for blue spectrum light) and sodium lamps (for orange spectrum light).
These are available in varying degrees of power from small 250 Watt Systems to extremely powerful 1000 Watt Systems.
The latest development in plant lighting is in the form of LED grow lights. Still at the research and development stage, early testing shows deficiencies in spectrum, but with technology rapidly evolving, these LED plant grow light systems are probable the next generation in waiting once the designs have been refined.
Growell - http://www.growell.co.uk
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